clésvsCSSTell them apart

Which to use

“clés” and “CSS” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#2,666
“clés” frequency rank
#18,705
“CSS” frequency rank
21371
confusion score

Side-by-Side Comparison

Feature clés CSS
Definition Pluriel de clé. Séquence d’instructions de rendu visuel, auditif ou tactile d’une ressource HTML ou XML.

Where the eye mixes clés and CSS

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

4 ch
clés
3 ch
CSS

Why the eye confuses clés with CSS

A purely visual mix-up. clés (\kle\) and CSS (\se ɛ.s‿ɛs\) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 21371, derived from the frequency rank of both members and their visual similarity.

clés is recorded at frequency rank #2,666, classified as anoun, pronounced \kle\. CSS is at rank #18,705, tagged as anoun, pronounced \se ɛ.s‿ɛs\.

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 21371, this pair ranks #363,525 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of clés vs CSS

Shared letters: cs. Private to "clés": . Private to "CSS": -.

"clés" · 4 letters · shape CCVC  ·  "CSS" · 3 letters · shape CCC

Frequently Asked Questions

Is swapping "clés" for "CSS" ever safe?
No. They are said differently (\kle\ versus \se ɛ.s‿ɛs\) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.
Which is more common, "clés" or "CSS"?
"clés" is the more common of the two: it sits at frequency rank #2,666 in our French list, against #18,705 for "CSS". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

  • Full dictionary entry for "clés" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "CSS" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #363,525 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
  • "clés" and "CSS" also get mixed up with nearby pairs, the highest-scored neighbour is "CCE vs CSS". Nearby pair

Confusion rank #363,525 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list