Which to use
“opt” is a verb and “ost” is a noun - they look or sound alike but fill different roles in a sentence.
- #42,502
- “opt” frequency rank
- #19,617
- “ost” frequency rank
- 62119
- confusion score
Side-by-Side Comparison
| Feature | opt | ost |
|---|---|---|
| Definition | Opter. | ou Armée au Moyen Âge. |
Where the eye mixes opt and ost
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Look-alike desk: opt vs ost
These two trip readers on the page rather than in the ear: opt is \ɒpt\ while ost is \ɔst\. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - p in “opt” becomes s in “ost”, and the parts of speech differ too (verb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 62119, derived from the frequency rank of both members and their visual similarity.
opt is recorded at frequency rank #42,502, classified as averb, pronounced \ɒpt\. ost is at rank #19,617, tagged as anoun, pronounced \ɔst\.
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 62119, this pair ranks #88,732 of 440,172 scored French confusable pairs - among the most confusable pairs.
Orthographic DNA of opt vs ost
Shared letters: ot. Private to "opt": p. Private to "ost": s.
"opt" · 3 letters · shape VCC · "ost" · 3 letters · shape VCC
Frequently Asked Questions
Do "opt" and "ost" mean the same thing in a sentence?
In ordinary French text, does "opt" or "ost" show up more?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "opt" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "ost" - compare definitions side by side with the headword page. Word entry
- This pair ranks #88,732 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "opt" and "ost" also get mixed up with nearby pairs, the highest-scored neighbour is "och vs opt". Nearby pair
Confusion rank #88,732 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.