CDU vs cy, What's the Difference?

Which to use

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

#23,795
“CDU” frequency rank: #27,395
“cy” frequency rank: 51190
confusion score

Side-by-Side Comparison

Feature	CDU	cy
Definition	Critère de défaillance unique.	Ci.

Letter map: CDU vs cy

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

3 ch

CDU

2 ch

Role in the sentence - CDU and cy

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: CDU is anoun and cyanadverb. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 51190, derived from the frequency rank of both members and their visual similarity.

CDU is recorded at frequency rank #23,795, classified as anoun, pronounced \se.de.y\. 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 51190, this pair ranks #156,898 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of CDU vs cy

Shared letters: c. Private to "CDU": du. Private to "cy": y.

"CDU" · 3 letters · shape CCV · "cy" · 2 letters · shape CV

Frequently Asked Questions

Do "CDU" and "cy" mean the same thing in a sentence?

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

In ordinary French text, does "CDU" or "cy" show up more?

"CDU" is the more common of the two: it sits at frequency rank #23,795 in our French list, against #27,395 for "cy". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Done with this confusable. These links stay specific to "CDU" and "cy".

Full dictionary entry for "CDU" 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 #156,898 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"CDU" and "cy" also get mixed up with nearby pairs, the highest-scored neighbour is "CCE vs cy". Nearby pair

Confusion rank #156,898 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.