Which to use
“once” and “onyx” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #11,815
- “once” frequency rank
- #42,501
- “onyx” frequency rank
- 54316
- confusion score
Side-by-Side Comparison
| Feature | once | onyx |
|---|---|---|
| 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. | Parfum antique. |
Where the spellings diverge
Shared letters are muted; the letters that actually set once and onyx apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
A purely visual mix-up. once (\ɔ̃s\) and onyx (\ɔ.niks\) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 54316, 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\. onyx is at rank #42,501, tagged as anoun, pronounced \ɔ.niks\.
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 54316, this pair ranks #134,847 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of once vs onyx
Shared letters: no. Private to "once": ce. Private to "onyx": xy.
"once" · 4 letters · shape VCCV · "onyx" · 4 letters · shape VCVC
Known mistypes of this pair
Frequency comparison
Frequently Asked Questions
Can "once" and "onyx" be used interchangeably?
Which is more common, "once" or "onyx"?
Remembering once vs onyx
The fastest way to pick the right one every time.
- Read both glosses above and match the meaning you intend, only context separates this pair.
- See each word in full, definition, IPA, etymology and its other confusables. Full “once” entry
- Browse more pairs most likely to be confused. Most confusable