Which to use
“chaux” and “cieux” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #12,530
- “chaux” frequency rank
- #10,291
- “cieux” frequency rank
- 22821
- confusion score
Side-by-Side Comparison
| Feature | chaux | cieux |
|---|---|---|
| Definition | Oxyde de calcium, alcalin fort, obtenu par la décarbonatation à haute température, durant un temps long, de roches calcaires (→ voir chaux vive). | Pluriel de ciel, utilisé dans un sens singulier. |
Where the eye mixes chaux and cieux
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence. chaux (CCVVC) and cieux (CVVVC) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Look-alike desk: chaux vs cieux
A purely visual mix-up. chaux (\ʃo\) and cieux (\sjø\) 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 22821, derived from the frequency rank of both members and their visual similarity.
chaux is recorded at frequency rank #12,530, classified as anoun, pronounced \ʃo\. cieux is at rank #10,291, tagged as anoun, pronounced \sjø\.
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 22821, this pair ranks #355,986 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of chaux vs cieux
Shared letters: cux. Private to "chaux": ah. Private to "cieux": ei.
"chaux" · 5 letters · shape CCVVC · "cieux" · 5 letters · shape CVVVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "chaux" for "cieux" ever safe?
In ordinary French text, does "chaux" or "cieux" show up more?
Useful next steps
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "chaux" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "cieux" - compare definitions side by side with the headword page. Word entry
- This pair ranks #355,986 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "chaux" and "cieux" also get mixed up with nearby pairs, the highest-scored neighbour is "chah vs chaux". 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 #355,986 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.