sailor vs chapeau

sailor and chapeau both are nouns.

Word	Noun	Adjective	Verb	Adverb
sailor	Yes	No	No	No
chapeau	Yes	No	No	No

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

sailor: a stiff hat made of straw with a flat crown
chapeau: headdress that protects the head from bad weather; has shaped crown and usually a brim

Other hypernyms of sailor include hat, lid.

sailor (noun)	chapeau (noun)
a stiff hat made of straw with a flat crown	headdress that protects the head from bad weather; has shaped crown and usually a brim
any member of a ship's crew
a serviceman in the navy