Prophecy vs Prophesy: What's the Difference?
Prophecy is the prediction itself (a noun); prophesy is the act of predicting (a verb).
Word Origins & Etymology
Both come from Greek prophetes, "one who speaks for a god." English split the spellings to mark word class: prophecy for the noun, prophesy for the verb.
It is the same noun/verb pattern as advice/advise — the noun ends in a "see" sound, the verb in a "sigh" sound.
The noun ends in -cy (prophecy) and rhymes with "sea." The verb ends in -sy (prophesy) and rhymes with "sigh." Thing → -cy; action → -sy.
⚡ Quick Answer
Prophesy = to predict (verb). Ends in -sy, rhymes with "sigh."
Memory Trick: Prophecy = noun, and it rhymes with "see the future." Prophesy = verb, and the s stands for "say/predict." Thing → cy; action → sy.
🔑 Key Takeaway
If you mean the prediction itself, use the noun prophecy (-cy). If you mean the act of predicting, use the verb prophesy (-sy).
| Word | Type | Meaning | Example | Rhymes with |
|---|---|---|---|---|
| Prophecy | Noun | A prediction | "an ancient prophecy" | sea |
| Prophesy | Verb | To predict | "prophesy doom" | sigh |
Quick Comparison
| Form | Use It For | Quick Check |
|---|---|---|
| Prophecy | The prediction itself | Could you put "a/the" before it? Use the noun prophecy. |
| Prophesy | The act of predicting | Could you replace it with to predict? Use the verb prophesy. |
| Sound test | Telling them apart aloud | "sea" → prophecy; "sigh" → prophesy. |
When to Use "Prophecy"
Prophecy is a noun: a prediction or foretelling, often with a sense of destiny. You can count prophecies and put articles before them.
- The prophecy foretold a great flood.
- It was a self-fulfilling prophecy.
- Ancient prophecies filled the scroll.
When to Use "Prophesy"
Prophesy is a verb: to predict or foretell. It conjugates normally: prophesy, prophesied, prophesying.
- Analysts prophesy a market crash.
- The oracle prophesied his downfall.
- She would never prophesy the outcome.
The fix: the prediction is a prophecy (a thing); making the prediction is to prophesy (an action). It is the same split as advice vs advise — noun ends in the "see" sound, verb in the "sigh" sound.
A Pronunciation Anchor
Because the spelling difference is a single letter, let your ear decide: read the sentence aloud. If the word lands on a "see" sound (PROF-uh-see), it is the noun prophecy; if it ends on "sigh" (PROF-uh-sigh), it is the verb prophesy. Unlike some pairs, both British and American English keep this c/s split, so the rule travels. The person who foretells is a prophet; the act is to prophesy; the thing foretold is a prophecy.
Verbs That Hide a Noun Twin
English keeps a small club of pairs where a quiet spelling change marks noun versus verb, and prophecy/prophesy belongs to it. The closest cousins are advice/advise and device/devise: in each, the noun takes the calmer ending and the verb takes the buzzier one. Once you file prophecy with that group, the verb conjugates without surprises — prophesy, prophesies, prophesied, prophesying — while the noun simply pluralizes to prophecies. Watch the third-person form especially: it is she prophesies (verb), never she prophecies. A last anchor for proofreading: if an article such as a, the, or an ancient sits in front of the word, you almost certainly want the noun prophecy; if a subject is doing the predicting, you want the verb prophesy.
Common Mistakes
Mistake #1: "an old prophesy"
✗ Wrong: An old prophesy warned of the storm.
✓ Right: An old prophecy warned of the storm.
Reason: The prediction itself is the noun prophecy (-cy).
Mistake #2: "they prophecy doom"
✗ Wrong: Critics prophecy doom for the industry.
✓ Right: Critics prophesy doom for the industry.
Reason: To predict is the verb prophesy (-sy).
Mistake #3: "he prophecied"
✗ Wrong: The seer prophecied a famine.
✓ Right: The seer prophesied a famine.
Reason: The past tense of the verb is prophesied.
Mistake #4: "fulfill the prophesy"
✗ Wrong: The hero fulfilled the prophesy.
✓ Right: The hero fulfilled the prophecy.
Reason: A prophecy (noun) is what gets fulfilled.
🎯 Test Your Knowledge
1. The ancient ____ spoke of a chosen one.
2. Economists ____ slower growth next year.
3. The witch ____ a long winter. (past tense)
4. It became a self-fulfilling ____.
5. Who can ____ the future with certainty?
See It Live: Our Engine Flags a Real Mistake
This box runs Grammarlyzer’s real engine as you type. The starter sentence uses the noun prophecy where the verb prophesy belongs — edit it or paste your own.
Expected correction: The elders would often prophesy about the coming harvest.
Honest limits: the engine catches spelling and agreement, but prophecy vs prophesy turns on role — the prediction (noun) or predicting (verb). Decide which you mean, then run the check.
Frequently Asked Questions
Is it "prophecy" or "prophesy" for a prediction?
How are they pronounced?
Is this the same pattern as advice and advise?
What is the past tense of prophesy?
What is the plural of prophecy?
Real-World Examples
The prophecy shaped the hero’s journey.
Pundits prophesy a downturn.
The fortune teller prophesied a journey.
It became a self-fulfilling prophecy.
The text contains several prophecies.
I would not dare prophesy the result.
The scroll held a powerful prophesy.
They prophecy hard times ahead.
Why Do People Confuse Them?
Prophecy and prophesy differ by one letter and a subtle vowel sound, so the noun/verb line blurs — especially since both relate to predicting. The reliable fix is the -cy/-sy pattern shared with advice/advise: the noun (a thing) ends in -cy with a "see" sound; the verb (an action) ends in -sy with a "sigh" sound.
Prophecy vs prophesy follows the noun/verb spelling family. Master it alongside advice vs advise and device vs devise.
Related Articles
- Advice vs Advise — The same noun-vs-verb spelling split
- Device vs Devise — Another -ice/-ise noun/verb pair
- Affect vs Effect — A noun/verb confusable to master next
- Similar-Sounding Words — Continue through more near-twins
- ← View All Grammar Guides
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