Which to use
“C1” is a noun and “Ct” is a name - they look or sound alike but fill different roles in a sentence.
- #12,528
- “C1” frequency rank
- #9,461
- “Ct” frequency rank
- 21989
- confusion score
Side-by-Side Comparison
| Feature | C1 | Ct |
|---|---|---|
| Definition | Niveau de langue correspondant à un niveau expérimenté (autonome) : personne capable de comprendre des textes longs et exigeants et saisir des significations implicites ; s’exprimer spontanément et couramment sans trop devoir chercher ses mots ; utiliser la langue de façon efficace et souple dans la vie sociale, professionnelle ou académique ; s’exprimer sur des sujets complexes de façon claire et bien structurée et manifester son contrôle des outils linguistiques d'organisation, d’articulation et de cohésion du discours. | « Combault » dans Pontault-Combault. |
Where the eye mixes C1 and Ct
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Visual trap between C1 and Ct
These two trip readers on the page rather than in the ear: C1 is \se.œ̃\ while Ct is \kɔ̃.bo\. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - 1 in “C1” becomes t in “Ct”, and the parts of speech differ too (noun vs name), which is usually the fastest check. Our composite confusion score for this pair is 21989, derived from the frequency rank of both members and their visual similarity.
C1 is recorded at frequency rank #12,528, classified as anoun, pronounced \se.œ̃\. Ct is at rank #9,461, tagged as aname, pronounced \kɔ̃.bo\.
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 21989, this pair ranks #360,380 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of C1 vs Ct
Shared letters: c. Private to "C1": -. Private to "Ct": t.
"C1" · 1 letters · shape C · "Ct" · 2 letters · shape CC
Frequently Asked Questions
Can "C1" and "Ct" be used interchangeably?
Which is more common, "C1" or "Ct"?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "C1" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "Ct" - compare definitions side by side with the headword page. Word entry
- This pair ranks #360,380 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "C1" and "Ct" also get mixed up with nearby pairs, the highest-scored neighbour is "C1 vs CCE". Nearby pair
Confusion rank #360,380 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.