Which to use
“once” is a noun and “onu” is a pronoun - they look or sound alike but fill different roles in a sentence.
- #11,815
- “once” frequency rank
- #4,259
- “onu” frequency rank
- 16074
- confusion score
Side-by-Side Comparison
| Feature | once | onu |
|---|---|---|
| Definition | Unité de mesure de la masse (système impérial britannique avoirdupois), qui vaut 28,3495231 grammes pour l'once commune → voir ounce. Ses symboles sont oz et ℥. L'once troy (troy ounce) équivaut pour sa part à 31,1034768 grammes. | Accusatif de o. |
Where the eye mixes once and onu
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Look-alike desk: once vs onu
These two trip readers on the page rather than in the ear: once is \ɔ̃s\ while onu is \o.ˈnu\. 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 (noun vs pronoun), which is usually the fastest check. Our composite confusion score for this pair is 16074, derived from the frequency rank of both members and their visual similarity.
once is recorded at frequency rank #11,815, classified as anoun, pronounced \ɔ̃s\. onu is at rank #4,259, tagged as apron, pronounced \o.ˈnu\.
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 16074, this pair ranks #389,509 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of once vs onu
Shared letters: no. Private to "once": ce. Private to "onu": u.
"once" · 4 letters · shape VCCV · "onu" · 3 letters · shape VCV
Known mistypes of this pair
- once ← ocne · oncce · onec · onnce
Frequently Asked Questions
Can "once" and "onu" be used interchangeably?
Frequency check: "once" vs "onu" - which ranks higher?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "once" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "onu" - compare definitions side by side with the headword page. Word entry
- This pair ranks #389,509 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "once" and "onu" also get mixed up with nearby pairs, the highest-scored neighbour is "och vs once". 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 #389,509 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.