Which to use
“prolong” is a verb and “proton” is a noun - they look or sound alike but fill different roles in a sentence.
- #22,183
- “prolong” frequency rank
- #16,779
- “proton” frequency rank
- 38962
- confusion score
Side-by-Side Comparison
| Feature | prolong | proton |
|---|---|---|
| Definition | To extend in space or length. | 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 prolong and proton
Muted = shared; highlighted = the visual trap. They share 5 letters in sequence. prolong runs 7 letters (CCVCVCC) against proton's 6 (CCVCVC) - the length gap alone is often enough to separate them once you know to check it.
Visual trap between prolong and proton
These two trip readers on the page rather than in the ear: prolong is /pɹəʊˈlɒŋ/ while proton is /ˈpɹəʊ.tɒn/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (verb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 38962, derived from the frequency rank of both members and their visual similarity.
prolong is recorded at frequency rank #22,183, classified as averb, pronounced /pɹəʊˈlɒŋ/. 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 38962, this pair ranks #281,095 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of prolong vs proton
Shared letters: nopr. Private to "prolong": gl. Private to "proton": t.
"prolong" · 7 letters · shape CCVCVCC · "proton" · 6 letters · shape CCVCVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "prolong" for "proton" ever safe?
Which is more common, "prolong" or "proton"?
What to do next
Eye-level mix-up between "prolong" and "proton" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "prolong" 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 #281,095 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "prolong" and "proton" also get mixed up with nearby pairs, the highest-scored neighbour is "prolong vs prowling". 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 #281,095 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.