- Le coq = the cock (rooster)
- Le jeune coq = the cockerel (young rooster)
I have lived in the UK all my life and never knew that a cockerel was a young cock. I thought the two words were synonyms (also with rooster). But for the benefit of non native British speakers, be careful when you use the word cock. While entirely appropriate as a synonym for rooster, it more usually is used for part of the male anatomy!