Welcome to Word Stacks—your weekly dose of high-impact SAT vocabulary built from the roots up. Each stack introduces a curated set of words that don’t just appear on the SAT—they define it (no pun intended). Rather than memorizing endless lists of random words, we focus on unlocking the logic behind the words you may encounter on the SAT. *Mr. John's Test Prep has no affiliation or endorsement with the College Board.
Word Stacks
With a little help from AI, I've compiled some data trends on the tough vocabulary words that r/SAT moderator "yodatsracist" and roots2words.com have documented for all documented SATs from March 2024 through December 2025. After analyzing every SAT vocabulary quiz from March 2024 through
Word Stacks
📚 Advanced Prefix Flashcards Card 1 of 8 superfluous adjective SUPER- (above) + FLU- (flow) 👆 Click to flip unnecessary or excessive; more than needed The editor removed all superfluous details from the manuscript, keeping only essential information. ← Previous 🔄 Shuffle Next → Section 1: Match Words with Definitions Click on a word, then click
Word Stacks
📚 Prefix Vocabulary Flashcards Card 1 of 9 prolific adjective PRO- (forward) + LIF- (offspring) 👆 Click to flip producing many works; highly productive The prolific novelist published five bestselling books in just three years. ← Previous 🔄 Shuffle Next → Section 1: Match Words with Definitions Click on a word, then click on its matching
Word Stacks
📚 Week 5 Prefix Flashcards Card 1 of 8 multiplicity noun Root: MULTI- (many) + PLIC- (fold) 👆 Click to flip a large number of diverse elements "The multiplicity of voices in the busy marketplace created a cacophony that made it difficult to hear individual conversations." ← Previous 🔄 Shuffle Next → Section 1:
Word Stacks
📚 Week 4 Prefix Flashcards Card 1 of 8 interject verb Root: INTER- (between) + JECT- (throw) 👆 Click to flip to interrupt with a comment or remark "During the heated board meeting, the CEO had to interject several times to clarify misconceptions about the company's financial position." ← Previous
Word Stacks
📚 Week 3 Prefix Flashcards Card 1 of 8 ensue verb Root: EN- (make) + SUE (follow) 👆 Click to flip to follow as a consequence or result "After the company announced massive layoffs, chaos and uncertainty were sure to ensue as employees worried about their job security." ← Previous 🔄 Shuffle Next
Prefixes
📚 Advanced Prefix Flashcards Card 1 of 10 bipartisan adjective Root: BI- (two) + PARTISAN (supporter) 👆 Click to flip involving two political parties "The landmark legislation received bipartisan support, with members from both major political parties voting in favor of the environmental protection measures." ← Previous 🔄 Shuffle Next → Section 1: Match
Word Stacks
📚 Weekly SAT Prefix Flashcards Card 1 of 7 apathetic adjective Root: A- (without) + PATH- (feeling) 👆 Click to flip lacking interest or concern; indifferent "The teenager seemed completely apathetic about the upcoming election, showing no interest in any of the candidates or issues." ← Previous 🔄 Shuffle Next → Section 1: Match
Word Stacks
Section 1: Vocabulary Matching - Round 2 Click on a word, then click on its matching definition Matching Score: 0/16 Vocabulary Words abound attenuate capacious decisive emanate excise expound heterogeneous impervious impugn lambaste outmoded pernicious synopsis testament unnerved Definitions to be plentiful, prevalent, or overflowing with able to hold
Official SAT Vocab
Section 1: Vocabulary Matching Click on a word, then click on its matching definition Matching Score: 0/17 Vocabulary Words abate capricious conflate conjecture cursory discerning epitomize eschew exhaustive imperious manifest myriad quotidian ubiquitous undermine verisimilitude vindictive Definitions the appearance of truth; realistic or resembling reality to diminish in force
Official SAT Vocab
Section 1: Vocabulary Matching - Round 2 Click on a word, then click on its matching definition Matching Score: 0/25 Vocabulary Words augment belie burgeoning coalesce contentious decouple decry expedite fecund harbinger heterogeneity induce insurmountable misconstrue modulate orthodox oscillate preclude recapitulate refute steward substantiate supplant unfounded Definitions to increase,
Official SAT Vocab
Section 1: Vocabulary Matching - Round 1 Click on a word, then click on its matching definition Matching Score: 0/17 Vocabulary Words alleviate ameliorate anomalous eschew equivocal evince exacerbate facetious idiosyncratic inexplicable precede proponent rescind surreptitious tenuous ubiquitous vindicate Definitions to make more bearable; to lessen pain, grief, or