These 27 scientific vocabulary words drive the relationship questions in Digital SAT science passages. Learn how each one signals whether new data supports, contradicts, or extends an existing theory.
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27 Scientific SAT Vocabulary Words from Real Research Passages
Science passages on the Digital SAT do not test your knowledge of biology or physics. They test your ability to understand relationships between data points.
Most students get these questions wrong not because they misunderstand the experiment, but because they miss the one word that explains how two theories interact. Does the new data support the old theory? Does it contradict it? Or does it simply add to it?
Below is a curated list of 27 high-frequency vocabulary words that appear specifically in SAT research and science contexts. We will start with a deep dive into the top 5 most critical words, followed by a complete study grid.
Why Vocabulary in Context Matters for the Digital SAT
The College Board designs the Digital SAT Reading and Writing section to test your ability to understand how words function within a passage. You will not be asked to define a word in isolation. Instead, you must determine which word best fits the logical relationship described in the text. This is why mastering these vocabulary-in-context words is a direct path to improving your score. These words appear repeatedly in the science and social science passages that make up a significant portion of the test.
According to the official College Board test specifications for the Digital SAT, the Reading and Writing section includes passages from a range of content areas, including science and social studies. The questions are designed to measure your reading comprehension and command of evidence, not your prior knowledge of the subject. By focusing on the vocabulary that signals relationships between ideas, you can answer these questions with confidence.
Top 5 Scientific Relationship Words (Deep Dive)
1. Complement
Definition: To complete something or make it better; to work together perfectly.
Part of Speech: Verb
Difficulty: ★★★★☆ (Hard)
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Start 1-day free trial →Synonyms: Enhance, complete, perfect, round out
Example Sentence:
"While the satellite data provided a broad overview of the forest, the on-the-ground soil samples complemented these findings by offering detailed chemical analysis."
How the SAT Tests It:
The "Combination" Pattern
The SAT uses this word when two different research methods are used together. Look for phrases like:
- "Use X along with Y..."
- "To gain a fuller understanding..."
- "Combine these approaches..."
Tip: Do not confuse this with "Compliment" (with an 'i'), which means to praise someone.
2. Corroborate
Definition: To confirm or give support to a statement, theory, or finding.
Part of Speech: Verb
Difficulty: ★★★★☆ (Hard)
Synonyms: Confirm, verify, endorse, ratify, authenticate
Example Sentence:
"Initial results suggested the enzyme was active at high temperatures, a finding that was later corroborated by three independent laboratories."
How the SAT Tests It:
The "Agreement" Pattern
This appears when a second study gets the same results as the first study.
- Study A finds X.
- Study B is conducted.
- Study B finds X too.
Answer: Study B corroborates Study A.
3. Empirical
Definition: Based on observation or experience rather than theory or pure logic.
Part of Speech: Adjective
Difficulty: ★★★☆☆ (Medium)
Synonyms: Observational, experimental, factual, pragmatic
Example Sentence:
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"The philosopher's theory was interesting, but it lacked empirical evidence; he had never actually conducted an experiment to prove it."
4. Anomalous
Definition: Deviating from what is standard, normal, or expected.
Part of Speech: Adjective
Difficulty: ★★★★☆ (Hard)
Synonyms: Abnormal, atypical, irregular, aberrant
Example Sentence:
"Among the thousands of standard readings, one data point was anomalous, showing a temperature spike that no model had predicted."
How the SAT Tests It:
The "Outlier" Pattern
Used when a scientist finds something weird that does not fit the pattern. Often appears in questions about "outliers" or unexpected results.
5. Substantiate
Definition: To provide evidence to support or prove the truth of something.
Part of Speech: Verb
Difficulty: ★★★★★ (Expert)
Synonyms: Prove, support, justify, vindicate
Example Sentence:
"The geologist claimed the rock was from Mars, but she could not substantiate this claim with chemical analysis."
Common Mistakes Students Make with Scientific Vocabulary
When practicing these science vocabulary questions, students often fall into predictable traps. One common error is choosing a word that sounds scientific but does not match the logical relationship in the sentence. For example, a student might pick "undermine" when the passage describes two studies that agree, simply because "undermine" sounds like a strong academic word. Another mistake is ignoring the clue words in the sentence. Words like "however," "similarly," "for example," and "in contrast" are signposts that tell you exactly what kind of relationship the missing word must express.
To avoid these errors, read the entire sentence before looking at the answer choices. Identify the relationship first. Is the new idea supporting, contradicting, or adding to the old idea? Then find the word that matches that relationship. This strategy works for every vocabulary-in-context question on the Digital SAT.
22 More Scientific SAT Words (The Condensed List)
These words appear frequently in modules about biology, astronomy, and psychology. We have grouped them by how they are used. This list rounds out the science vocabulary you need to know.
Group A: Words for "Adding Support"
| Word | Definition | SAT Context |
|---|---|---|
| Augment | To make something greater by adding to it. | Adding more data to a study. |
| Bolster | To support or strengthen. | New evidence strengthens a weak theory. |
| Reinforce | To strengthen an existing idea. | A second experiment gets the same result. |
| Validate | To check or prove the accuracy of something. | Confirming a hypothesis is correct. |
| Advocate | To publicly recommend or support. | Scientists supporting a specific policy. |
Group B: Words for "Disagreement and Doubt"
| Undermine | To lessen the effectiveness or power of. | New bad data makes a theory look wrong. |
| Refute | To prove a statement or theory wrong. | Disproving a hypothesis completely. |
| Sceptical | Not easily convinced; having doubts. | Scientists doubting a bold new claim. |
| Contend | To assert something as a position in an argument. | A scientist arguing for a specific view. |
| Discordant | Disagreeing or incongruous. | Data that does not match the rest. |
Group C: Research Methodology Words
| Hypothesis | A proposed explanation made on limited evidence. | The starting guess before the experiment. |
| Qualitative | Measuring by quality rather than quantity. | Describing behavior, not numbers. |
| Quantitative | Measuring by quantity (numbers). | Using statistics and hard data. |
| Correlation | A mutual relationship between two things. | As temperature goes up, ice goes down. |
| Causation | The action of causing something. | Heat causes ice to melt (more than just correlation). |
| Consensus | General agreement. | When most scientists agree on a theory. |
| Tentative | Not certain or fixed; provisional. | Early results that might change later. |
| Plausible | Seeming reasonable or probable. | A theory that makes sense but is not proven. |
| Synthesize | To combine numbers of things into a coherent whole. | Combining results from three studies into one paper. |
| Foreground | To make something the most prominent feature. | To emphasize one specific data point. |
| Categorize | To place in a particular class or group. | Sorting plants by species. |
| Anticipate | To regard as probable; expect or predict. | Predicting a result before it happens. |
How to Apply These Words on Test Day
On test day, you will see these words in the context of a passage about a scientific study. Your job is not to recall a dictionary definition but to see how the word fits the logic of the argument. When you encounter a vocabulary-in-context question, follow these steps. First, read the sentence that contains the blank and the sentences immediately before and after. Second, identify the relationship between the ideas. Third, predict a word that expresses that relationship. Fourth, check the answer choices for a match. This process works for every question in the Reading and Writing section.
Using the Bluebook app to take official practice tests is the best way to get comfortable with this format. The College Board provides four full-length Digital SAT practice tests in Bluebook. Each test includes vocabulary-in-context questions that use words like the ones on this list. Review your results to see which relationship patterns you miss most often.
Bonus Strategy: The "Complement vs. Compliment" Trap
One of the most common traps on the Digital SAT is the confusion between words that sound the same but mean very different things. The "Complementing" trap appeared on the December 2025 SAT. Mastering this distinction is a key part of your Digital SAT reading study plan.
Complement (with an E) vs. Compliment (with an I)
1. Complement (with an E)
- Meaning: To complete something. To add to it to make it better.
- Trick: ComplEment = ComplEte.
- SAT Context: "The study of live plants complemented the herbarium data." (They worked together).
2. Compliment (with an I)
- Meaning: To say something nice.
- Trick: "I like compliments."
- SAT Context: Almost never the answer in science passages. Scientists rarely praise each other's outfits in research papers.
Practice: Test Your New Vocabulary
While satellite imagery provides researchers with broad geographic coverage of forest health, it cannot capture the detailed chemical composition of individual leaves. _________ satellite data with on-the-ground sampling allows ecologists to develop more accurate models of forest ecosystem function.
Which choice completes the text with the most logical and precise word?
- A) Replacing
- B) Supplementing (Correct)
- C) Challenging
- D) Documenting
Explanation: The satellite data has a gap (no chemical detail). The ground sampling fills that gap. They work together. "Supplementing" (or "Complementing") is the only word that means "adding to make complete."
Stop Guessing on Vocabulary Questions
Memorizing lists is good, but practicing in context is better. Take a free full-length practice test with no card, plus free Targeted Practice. Both put these relationship words in the passages where they appear.
Practice with realistic Digital SAT questions and see which relationship patterns you miss.
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References and Further Reading
- Official SAT Suite - What Is on the SATSupports: The Digital SAT Reading and Writing section includes passages from a range of content areas, including science and social studies.- College Board, the test publisher.
Frequently Asked Questions
What are the top 5 scientific SAT vocabulary words for 2025-2026?
The top 5 scientific relationship words are complement, corroborate, empirical, and anomalous, as detailed in the text with definitions and SAT testing patterns.
How does the SAT test vocabulary in context?
The SAT tests vocabulary by requiring students to determine which word best fits the logical relationship described in the text, not by asking for definitions in isolation.
What does 'corroborate' mean in SAT science passages?
Corroborate means to confirm or give support to a statement, theory, or finding, often used when a second study gets the same results as the first.
What is the difference between 'complement' and 'compliment'?
Complement means to complete or make something better, while compliment (with an 'i') means to praise someone.
What does 'empirical' mean in SAT vocabulary?
Empirical means based on observation or experience rather than theory or pure logic, referring to real, measurable data.