CDD vs CFF, What's the Difference?

Which to use

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

#11,538
“CDD” frequency rank: #46,639
“CFF” frequency rank: 58177
confusion score

Side-by-Side Comparison

Feature	CDD	CFF
Definition	Contrat à durée déterminée, type de contrat de travail en France.	Société anonyme (détenue à 100 % par la Confédération suisse) exploitant les chemins de fer suisses.

Where the eye mixes CDD and CFF

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

3 ch

CDD

3 ch

CFF

Why the eye confuses CDD with CFF

A purely visual mix-up. CDD (\se.de.de\) and CFF (\se.ɛf.ɛf\) 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 58177, derived from the frequency rank of both members and their visual similarity.

CDD is recorded at frequency rank #11,538, classified as anoun, pronounced \se.de.de\. CFF is at rank #46,639, tagged as anoun, pronounced \se.ɛf.ɛf\.

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 58177, this pair ranks #110,595 of 440,172 scored French confusable pairs - among the most confusable pairs.

Orthographic DNA of CDD vs CFF

Shared letters: c. Private to "CDD": d. Private to "CFF": f.

"CDD" · 3 letters · shape CCC · "CFF" · 3 letters · shape CCC

Frequently Asked Questions

Is swapping "CDD" for "CFF" ever safe?

No. They are said differently (\se.de.de\ versus \se.ɛf.ɛf\) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

Which is more common, "CDD" or "CFF"?

"CDD" is the more common of the two: it sits at frequency rank #11,538 in our French list, against #46,639 for "CFF". 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 "CDD" and "CFF" is sorted above. Next: full entries or other pairs that share a letter shape.

Full dictionary entry for "CDD" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "CFF" - compare definitions side by side with the headword page. Word entry
This pair ranks #110,595 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"CDD" and "CFF" also get mixed up with nearby pairs, the highest-scored neighbour is "CCE vs CFF". Nearby pair

Confusion rank #110,595 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.