Which to use
“proof” and “proton” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #2,052
- “proof” frequency rank
- #16,779
- “proton” frequency rank
- 18831
- confusion score
Side-by-Side Comparison
| Feature | proof | proton |
|---|---|---|
| Definition | An effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial. | A positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element, composed of two up quarks and a down quark. |
Where the eye mixes proof and proton
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.
Look-alike desk: proof vs proton
A purely visual mix-up. proof (/pɹuːf/) and proton (/ˈpɹəʊ.tɒn/) 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 1 letter(s) in length. Our composite confusion score for this pair is 18831, derived from the frequency rank of both members and their visual similarity.
proof is recorded at frequency rank #2,052, classified as anoun, pronounced /pɹuːf/. proton is at rank #16,779, tagged as anoun, pronounced /ˈpɹəʊ.tɒn/.
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 18831, this pair ranks #442,276 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of proof vs proton
Shared letters: opr. Private to "proof": f. Private to "proton": nt.
"proof" · 5 letters · shape CCVVC · "proton" · 6 letters · shape CCVCVC
Known mistypes of this pair
Frequently Asked Questions
Do "proof" and "proton" mean the same thing in a sentence?
In ordinary English text, does "proof" or "proton" show up more?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "proof" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "proton" - compare definitions side by side with the headword page. Word entry
- This pair ranks #442,276 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "proof" and "proton" also get mixed up with nearby pairs, the highest-scored neighbour is "poon vs proton". 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 #442,276 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.