Which to use
“pro” and “proof” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #1,232
- “pro” frequency rank
- #2,052
- “proof” frequency rank
- 3284
- confusion score
Side-by-Side Comparison
| Feature | pro | proof |
|---|---|---|
| Definition | An advantage of something, especially when contrasted with its disadvantages (cons). | 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 pro and proof
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.
Visual trap between pro and proof
A purely visual mix-up. pro (/pɹəʊ/) and proof (/pɹuːf/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 2 extra letter(s) - “pro” sits inside “proof”. Our composite confusion score for this pair is 3284, derived from the frequency rank of both members and their visual similarity.
pro is recorded at frequency rank #1,232, classified as anoun, pronounced /pɹəʊ/. 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 3284, this pair ranks #522,565 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of pro vs proof
Shared letters: opr. Private to "pro": -. Private to "proof": f.
"pro" · 3 letters · shape CCV · "proof" · 5 letters · shape CCVVC
Known mistypes of this pair
- proof ← porof · pproof · prof · profo · prooff · prroof · rpoof
Frequently Asked Questions
Is swapping "pro" for "proof" ever safe?
Which is more common, "pro" or "proof"?
What to do next
Eye-level mix-up between "pro" and "proof" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "pro" 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 #522,565 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "pro" and "proof" also get mixed up with nearby pairs, the highest-scored neighbour is "PPA vs pro". 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 #522,565 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.