CPIvsCSSWhich spelling fits?

Which to use

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

#20,409
“CPI” frequency rank
#18,705
“CSS” frequency rank
39114
confusion score

Side-by-Side Comparison

Feature CPI CSS
Definition Synonyme de Cour pénale internationale. Séquence d’instructions de rendu visuel, auditif ou tactile d’une ressource HTML ou XML.

Where the eye mixes CPI and CSS

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

3 ch
CPI
3 ch
CSS

Why the eye confuses CPI with CSS

A purely visual mix-up. CPI (\se.pe.i\) 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 share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 39114, derived from the frequency rank of both members and their visual similarity.

CPI is recorded at frequency rank #20,409, classified as anoun, pronounced \se.pe.i\. 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 39114, this pair ranks #250,406 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of CPI vs CSS

Shared letters: c. Private to "CPI": ip. Private to "CSS": s.

"CPI" · 3 letters · shape CCV  ·  "CSS" · 3 letters · shape CCC

Frequently Asked Questions

Can "CPI" and "CSS" be used interchangeably?
No. They are said differently (\se.pe.i\ versus \se ɛ.s‿ɛs\) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.
Frequency check: "CPI" vs "CSS" - which ranks higher?
"CSS" is the more common of the two: it sits at frequency rank #18,705 in our French list, against #20,409 for "CPI". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Eye-level mix-up between "CPI" and "CSS" is sorted above. Next: full entries or other pairs that share a letter shape.

  • Full dictionary entry for "CPI" 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 #250,406 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
  • "CPI" and "CSS" also get mixed up with nearby pairs, the highest-scored neighbour is "CCE vs CPI". Nearby pair

Confusion rank #250,406 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