CDS vs cy, What's the Difference?

Which to use

“CDS” is a noun and “cy” is an adverb - they look or sound alike but fill different roles in a sentence.

#28,477
“CDS” frequency rank: #27,395
“cy” frequency rank: 55872
confusion score

Side-by-Side Comparison

Feature	CDS	cy
Definition	Séquence codante, région d'une séquence d'ADN codant une séquence d'acides aminés de protéine.	Ci.

Letter map: CDS vs cy

Shared letters muted; letters that set CDS and cy apart highlighted. Shared run: 1.

3 ch

CDS

2 ch

Role in the sentence - CDS and cy

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: CDS is anoun and cyanadverb. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 55872, derived from the frequency rank of both members and their visual similarity.

CDS is recorded at frequency rank #28,477, classified as anoun, pronounced \se.de.ɛs\. cy is at rank #27,395, tagged as anadv.

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 55872, this pair ranks #124,669 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of CDS vs cy

Shared letters: c. Private to "CDS": ds. Private to "cy": y.

"CDS" · 3 letters · shape CCC · "cy" · 2 letters · shape CV

Frequently Asked Questions

Is swapping "CDS" for "cy" ever safe?

No - they are not even the same part of speech. "CDS" is a noun and "cy" an adverb, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "CDS" or "cy"?

"cy" is the more common of the two: it sits at frequency rank #27,395 in our French list, against #28,477 for "CDS". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

You've compared "CDS" and "cy". Here's where to go from here.

Full dictionary entry for "CDS" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "cy" - compare definitions side by side with the headword page. Word entry
This pair ranks #124,669 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"CDS" and "cy" also get mixed up with nearby pairs, the highest-scored neighbour is "CCE vs CDS". Nearby pair

Confusion rank #124,669 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.