Cordon

Cordon, s’il vous plaît = Open the door, please (to porters in Paris).

Corne

Ne faites pas de cornes à ce livre = Do not dog’s-ear that book.

Corneilles

Bayer aux corneilles = To stare (or, gape) about vacantly.

Corps

C’est un drôle de corps = He is an odd fellow, a queer fish.

Nous verrons ce qu’il a dans le corps = We will see what he is made of.