**GRE Vocabulary: Decoding Unfamiliar Words with Word Roots, Prefixes, and Suffixes**

GRE Vocabulary: Decoding Unfamiliar Words with Word Roots, Prefixes, and Suffixes

A Premium Study Guide for Serious GRE Candidates

What This Is

The GRE tests high-level vocabulary—words you may not know—by embedding them in complex sentences. Instead of brute-force memorization, word roots, prefixes, and suffixes let you decode unfamiliar words on the fly, turning a 330-level challenge into a 150-level warm-up. This skill is essential for: - Text Completion (e.g., "The biologist’s findings were so _ that even her critics had to concede their validity.") - Sentence Equivalence (e.g., "The author’s prose was _, marked by convoluted syntax and arcane references.") - Reading Comprehension (e.g., "The passage suggests that the philosopher’s argument is ‘specious’—most nearly meaning…")

Why it works: ETS reuses Greek/Latin roots (e.g., bene- = good, mal- = bad) across questions. Mastering 50 roots unlocks hundreds of words.

Key Concepts & Techniques

1. The "Root + Affix" Framework
2. What it is: Every word = root (core meaning) + prefix (before root) + suffix (after root).
3. When to use: When you see a word you don’t know (e.g., "benevolent" → bene- = good, vol- = will → "good-willed").

4. Pro tip: Start with the root—it’s the most reliable clue.

5. Prefixes: The "Before" Clues

6. What it is: 1–3 letters at the start of a word that reverse, intensify, or specify the root.
7. When to use: To guess opposites (un-, in-, dis-) or direction (pre- = before, post- = after).

8. Example: "The theory was discredited" → dis- = not, cred- = believe → "not believed."

9. Suffixes: The "After" Clues

10. What it is: Letters at the end that change the word’s part of speech or add nuance.
11. When to use: To predict if a word is a noun (-tion, -ment), adjective (-ous, -ive), or verb (-ize, -ate).

12. Example: "The loquacious speaker" → -ous = adjective, loqu- = talk → "talkative."

13. Negative Prefixes: The "Opposite" Trap

14. What it is: Un-, in-, im-, il-, ir-, non- all mean "not."
15. When to use: When a word seems positive but the sentence suggests a contrast (e.g., "His impeccable record" vs. "His impeachable record").

16. Trap: In- can mean "in" (infiltrate) or "not" (invisible). Context decides.

17. Intensifying Prefixes: The "More/Less" Signal

18. What it is: Hyper- = over, hypo- = under, super- = above, sub- = below.
19. When to use: To distinguish extremes (e.g., "hyperbole" = overstatement vs. "hypothermia" = under-temperature).

20. Example: "The superfluous details" → super- = over, flu- = flow → "overflowing (unnecessary)."

21. Suffixes That Change Part of Speech

22. What it is: -ize (verb), -tion (noun), -ous (adjective), -ly (adverb).
23. When to use: To eliminate wrong answer choices in Text Completion (e.g., if the blank needs a verb, cross out -tion nouns).

24. Example: "The magnify the issue" → Wrong (verb form is magnifies). "The magnification of the issue" → Correct.

25. Roots with Multiple Meanings

26. What it is: Some roots have 2+ meanings (e.g., duc- = lead or pull).
27. When to use: When a word’s meaning isn’t obvious (e.g., "induce" = lead into vs. "deduce" = pull out).

28. Solution: Cross-check with context (e.g., "The drug induces sleep" → "leads to").

29. False Friends: Roots That Look Similar but Aren’t

30. What it is: Spec- = look (spectacle), but spic- = sharp (spicy).
31. When to use: To avoid mixing up roots (e.g., "perspicacious" = sharp-minded, not "looking through").
32. Trap: Phil- = love (philosophy), but phob- = fear (phobia).

Step-by-Step Strategy (For Any Unfamiliar Word)

1. Isolate the Word

2. Underline the word and ignore the rest of the sentence for 2 seconds. Focus on structure (prefix/root/suffix).

3. Break It Down

4. Prefix → Root → Suffix (e.g., "circumspect" → circum- = around, spec- = look → "looking around").

5. Guess the Meaning

6. Combine the parts (e.g., "circumspect" → "looking around (cautiously)").

7. If stuck: Think of other words with the same root (e.g., spectacle, inspect).

8. Check Context

9. Does your guess fit the sentence? If not, re-evaluate the root (e.g., spec- can also mean "kind" in species).

10. Eliminate Wrong Answers

11. In Text Completion/Sentence Equivalence, cross out choices that don’t match your guess.

12. Pro tip: If two choices have the same root, one is usually a trap (e.g., benevolent vs. beneficial).

13. Confirm or Adjust

14. If no answer fits, re-examine the prefix/suffix (e.g., in- could mean "not" or "in").

Fully Worked GRE-Style Example

Question:
The scientist’s hypothesis was _, as it relied on data that had been thoroughly debunked by prior research. Choices:
A) tenable B) spurious C) veracious D) fallacious E) empirical

Step-by-Step Solution:

1. Isolate the Word

2. Blank needs an adjective describing a hypothesis based on debunked data.

3. Break Down the Choices

4. A) tenable → ten- = hold → "able to be held (defended)." Positive.
5. B) spurious → spur- = false (no clear root, but spurious = fake).
6. C) veracious → ver- = true → "truthful." Positive.
7. D) fallacious → fall- = deceive → "deceptive." Negative.

8. E) empirical → empir- = experience → "based on observation." Neutral.

9. Guess the Meaning

10. The sentence says the data was "thoroughly debunked" → the hypothesis is false/flawed.

11. Eliminate positives/neutrals: A, C, E are out.

12. Check Context

13. Between B (spurious) and D (fallacious), both mean "false," but:
    • Spurious = fake in origin (e.g., spurious claims).
    • Fallacious = logically flawed (e.g., fallacious argument).

14. The sentence mentions debunked data → logical flaw fits better.

15. Confirm

16. Fallacious aligns with "relied on debunked data."

Answer: D) fallacious

Common Mistakes

1. Mistake: Ignoring the prefix/suffix and guessing based on "how the word sounds."
2. Why it happens: Students rely on vague familiarity (e.g., "benevolent" sounds nice).

3. Correct approach: Always break the word down—even if you "sort of" know it.

4. Mistake: Assuming all in- prefixes mean "not."

5. Why it happens: In- is overrepresented in negative words (invisible, inactive).

6. Correct approach: Check if in- means "in" (infiltrate, inhabit). Context is key.

7. Mistake: Overlooking suffixes that change part of speech.

8. Why it happens: Students focus on roots but miss that -tion makes a noun.

9. Correct approach: Match the blank’s part of speech (e.g., if the blank needs a verb, -tion words are wrong).

10. Mistake: Memorizing roots without examples.

11. Why it happens: Students learn bene- = good but don’t link it to benefit, benign.

12. Correct approach: Associate each root with 2–3 words (e.g., bene- → benefit, benefactor, benevolent).

13. Mistake: Panicking when a root has multiple meanings.

14. Why it happens: Duc- = lead or pull → students freeze.
15. Correct approach: Use the sentence to decide (e.g., "The evidence deduced the suspect" → duc- = pull out).

GRE Traps & Timing

1. Trap: "Fake Roots"
2. ETS invents words with plausible roots to trick you (e.g., "prevaricate" looks like pre- + var- but means "lie").

3. How to avoid: If a root doesn’t match any known word, rely on context.

4. Trap: Suffixes That Look Like Roots

5. -logy (study of) is a suffix, not a root (e.g., biology = bio- + -logy).

6. How to avoid: Suffixes come at the end—don’t confuse them with roots.

7. Trap: Words with Opposite Prefixes

8. Flammable and inflammable both mean "able to burn" (despite in-).

9. How to avoid: Memorize exceptions (e.g., inflammable, valuable/invaluable).

10. Timing:

11. Text Completion (1 blank): 45–60 seconds.
12. Text Completion (2–3 blanks): 75–90 seconds.
13. Sentence Equivalence: 60–75 seconds.
14. Pro tip: If you’re stuck for >30 seconds, guess and move on—don’t let one word sink your section.

Quick Practice

Question:
The professor’s lecture was so _ that even the most attentive students struggled to follow her train of thought. Choices:
A) lucid B) convoluted C) perspicuous D) abstruse E) pellucid

Answer: B) convoluted or D) abstruse
Explanation:
- Convoluted = con- (together) + volut- (roll) → "rolled together (complicated)." - Abstruse = abs- (away) + trus- (push) → "pushed away (hard to understand)." - Both fit "struggled to follow." Lucid/pellucid/perspicuous mean "clear"—opposite of the clue.

Last-Minute Cram Sheet

1. Prefixes:
2. Un-/in-/im-/il-/ir-/non- = not (unhappy, inactive).
3. Pre- = before, post- = after (prewar, postscript).
4. Hyper- = over, hypo- = under (hyperbole, hypothermia).

5. Sub- = under, super- = above (submarine, superfluous).

6. Roots:

7. Bene- = good (benefit), mal- = bad (malicious).
8. Cred- = believe (credible), spec- = look (inspect).
9. Duc-/duct- = lead (conduct), scrib-/script- = write (scribe).

10. Phil- = love (philosophy), phob- = fear (claustrophobia).

11. Suffixes:

12. -tion/-ment = noun (action, argument).
13. -ous/-ive = adjective (dangerous, active).
14. -ize/-ate = verb (realize, activate).

15. -ly = adverb (quickly).

16. Traps:

17. In- can mean "in" (inhabit) or "not" (invisible).
18. Flammable = inflammable (both mean "burnable").

19. Spec- = look (spectacle) or kind (species).

20. Part-of-Speech Clues:

21. If the blank is after "the," it’s a noun (-tion, -ment).
22. If it describes a noun, it’s an adjective (-ous, -ive).

23. If it’s an action, it’s a verb (-ize, -ate).

24. Context Overrides Roots:

25. If the root suggests one meaning but the sentence contradicts it, trust the sentence.

26. Common Wrong Answers:

27. Words with opposite prefixes (e.g., beneficial vs. malevolent).

28. Words with similar roots but different meanings (e.g., credible vs. credulous).

29. Time-Savers:

30. Eliminate first—cross out 2–3 choices before analyzing.

31. Guess if stuck—don’t waste >30 seconds on one word.

32. High-Yield Roots to Memorize:

33. Ambi- = both (ambiguous), omni- = all (omnipotent).
34. Ante- = before (antebellum), post- = after (postpone).

35. Cis- = cut (scissors), fract- = break (fracture).

36. Final Check:

37. Does the word fit the sentence’s tone? (Positive/negative/neutral?)
38. Does the part of speech match? (Noun/verb/adjective?)