coiffeur vs hairdresser

coiffeur and hairdresser both are nouns.

Word	Noun	Adjective	Verb	Adverb
coiffeur	Yes	No	No	No
hairdresser	Yes	No	No	No

As nouns, hairdresser is a hypernym of coiffeur; that is, hairdresser is a word with a broader meaning than coiffeur:

Other hypernyms of coiffeur include hairstylist, styler, stylist, adult male, man.

coiffeur (noun)	hairdresser (noun)
a man hairdresser	someone who cuts or beautifies hair