Which to use
“osa” is a verb and “ost” is a noun - they look or sound alike but fill different roles in a sentence.
- #43,047
- “osa” frequency rank
- #19,617
- “ost” frequency rank
- 62664
- confusion score
Side-by-Side Comparison
| Feature | osa | ost |
|---|---|---|
| Definition | Troisième personne du singulier du passé simple de oser. | ou Armée au Moyen Âge. |
Where the eye mixes osa and ost
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Visual trap between osa and ost
These two trip readers on the page rather than in the ear: osa is \o.za\ while ost is \ɔst\. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - a in “osa” becomes t 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 62664, derived from the frequency rank of both members and their visual similarity.
osa is recorded at frequency rank #43,047, classified as averb, pronounced \o.za\. 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 62664, this pair ranks #85,979 of 440,172 scored French confusable pairs - among the most confusable pairs.
Orthographic DNA of osa vs ost
Shared letters: os. Private to "osa": a. Private to "ost": t.
"osa" · 3 letters · shape VCV · "ost" · 3 letters · shape VCC
Frequently Asked Questions
Can "osa" and "ost" be used interchangeably?
Frequency check: "osa" vs "ost" - which ranks higher?
What to do next
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "osa" 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 #85,979 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "osa" and "ost" also get mixed up with nearby pairs, the highest-scored neighbour is "och vs osa". Nearby pair
Confusion rank #85,979 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.