hat vs chapeau

hat and chapeau both are nouns.

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

As nouns, hat and chapeau are synonyms defined as:

hat and chapeau: headdress that protects the head from bad weather; has shaped crown and usually a brim

Other synonyms of hat include lid.

hat (noun)	chapeau (noun)
an informal term for a person's role	headdress that protects the head from bad weather; has shaped crown and usually a brim
headdress that protects the head from bad weather; has shaped crown and usually a brim

hat (verb)	chapeau (verb)
put on or wear a hat
furnish with a hat