Which to use
“prone” is an adjective and “proof” is a noun - they look or sound alike but fill different roles in a sentence.
- #7,961
- “prone” frequency rank
- #2,052
- “proof” frequency rank
- 10013
- confusion score
Side-by-Side Comparison
| Feature | prone | proof |
|---|---|---|
| Definition | Lying face-down. | An effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial. |
Where the eye mixes prone and proof
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.
Look-alike desk: prone vs proof
These two trip readers on the page rather than in the ear: prone is /pɹəʊn/ while proof is /pɹuːf/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 10013, derived from the frequency rank of both members and their visual similarity.
prone is recorded at frequency rank #7,961, classified as anadj, pronounced /pɹəʊn/. proof is at rank #2,052, tagged as anoun, pronounced /pɹuːf/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 10013, this pair ranks #494,476 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of prone vs proof
Shared letters: opr. Private to "prone": en. Private to "proof": f.
"prone" · 5 letters · shape CCVCV · "proof" · 5 letters · shape CCVVC
Known mistypes of this pair
Frequently Asked Questions
Can "prone" and "proof" be used interchangeably?
Which is more common, "prone" or "proof"?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "prone" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "proof" - compare definitions side by side with the headword page. Word entry
- This pair ranks #494,476 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "prone" and "proof" also get mixed up with nearby pairs, the highest-scored neighbour is "prone vs pruned". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #494,476 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.