coconvscoucouTell them apart

Which to use

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

#25,930
“cocon” frequency rank
#5,440
“coucou” frequency rank
31370
confusion score

Side-by-Side Comparison

Feature cocon coucou
Definition Enveloppe que se filent beaucoup de larves d’insectes, et dans laquelle doit s’opérer leur dernière mue. Nom normalisé de 11 genres assez hétérogènes comprenant 56 espèces d'oiseaux de la famille des cuculidés habitant l'Ancien Monde, essentiellement caractérisées par leur parasitisme de couvée, habitude par laquelle elles confient la couvaison et l'élevage des oisillons à d'autres espèces d'oiseaux le plus souvent plus petites qu'elles; l'espèce-type de ce groupe d'oiseaux est le coucou gris (Cuculus canorus) dont le cri a donné son nom au genre.

Where the eye mixes cocon and coucou

Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. cocon runs 5 letters (CVCVC) against coucou's 6 (CVVCVV) - the length gap alone is often enough to separate them once you know to check it.

5 ch
cocon
6 ch
coucou

Why the eye confuses cocon with coucou

A purely visual mix-up. cocon (\kɔ.kɔ̃\) and coucou (\ku.ku\) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 31370, derived from the frequency rank of both members and their visual similarity.

cocon is recorded at frequency rank #25,930, classified as anoun, pronounced \kɔ.kɔ̃\. coucou is at rank #5,440, tagged as anoun, pronounced \ku.ku\.

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 31370, this pair ranks #304,216 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of cocon vs coucou

Shared letters: co. Private to "cocon": n. Private to "coucou": u.

"cocon" · 5 letters · shape CVCVC  ·  "coucou" · 6 letters · shape CVVCVV

Known mistypes of this pair

  • cocon ← ccocon · ccoon · coccon · cocno · coconn · coocn · occon
  • coucou ← ccoucou · cocuou · couccou · coucuo · couocu · cuocou · ocucou

Frequently Asked Questions

Is swapping "cocon" for "coucou" ever safe?
No. They are said differently (\kɔ.kɔ̃\ versus \ku.ku\) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.
In ordinary French text, does "cocon" or "coucou" show up more?
"coucou" is the more common of the two: it sits at frequency rank #5,440 in our French list, against #25,930 for "cocon". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

  • Full dictionary entry for "cocon" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "coucou" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #304,216 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
  • "cocon" and "coucou" also get mixed up with nearby pairs, the highest-scored neighbour is "cocon vs croco". Nearby pair
  • Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes

Confusion rank #304,216 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