plug hat vs chapeau

plug hat and chapeau both are nouns.

Word	Noun	Adjective	Verb	Adverb
plug hat	Yes	No	No	No
chapeau	Yes	No	No	No

As nouns, chapeau is a hypernym of plug hat; that is, chapeau is a word with a broader meaning than plug hat:

plug hat: a felt hat that is round and hard with a narrow brim
chapeau: headdress that protects the head from bad weather; has shaped crown and usually a brim

Other hypernyms of plug hat include hat, lid.

plug hat (noun)	chapeau (noun)
a felt hat that is round and hard with a narrow brim	headdress that protects the head from bad weather; has shaped crown and usually a brim