OvsouiWhat's the difference?

Quick tell: O is a symbol, oui is an adverb, so they fill different roles in a sentence.

Which to use

“O” is a symbol and “oui” is an adverb - they look or sound alike but fill different roles in a sentence.

#807
“O” frequency rank
#132
“oui” frequency rank
939
confusion score

Side-by-Side Comparison

Feature O oui
Definition En logique, symbole de la proposition particulière négative. Mot utilisé pour apporter une réponse affirmative ou marquer l'accord sur une proposition. Il s’emploie aussi au début d’une phrase qui ne répond pas à une question exprimée ou au cours d’une phrase, pour marquer ou accentuer le caractère affirmatif de cette phrase. Il s’emploie dans le discours direct en réponse à une interrogation. Il est alors seul ou joint à des adverbes qui renforcent l’affirmation comme certes, vraiment, etc.

Letter map: O vs oui

Shared letters muted; letters that set O and oui apart highlighted. Shared run: 1.

1 ch
O
3 ch
oui

Spelling & Dictionary Insight

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: O is asymbol and ouianadverb. On the page they differ by 2 extra letter(s) - “O” sits inside “oui”. Our composite confusion score for this pair is 939, derived from the frequency rank of both members and their visual similarity.

O is recorded at frequency rank #807, classified as asymbol. oui is at rank #132, tagged as anadv, pronounced \wi\.

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 939, this pair ranks #438,884 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of O vs oui

Shared letters: o. Private to "O": -. Private to "oui": iu.

"O" · 1 letters · shape V  ·  "oui" · 3 letters · shape VVV

Frequently Asked Questions

Can "O" and "oui" be used interchangeably?
No - they are not even the same part of speech. "O" is a symbol and "oui" an adverb, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "O" or "oui"?
"oui" is the more common of the two: it sits at frequency rank #132 in our French list, against #807 for "O". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list