boater vs hat

boater and hat both are nouns.

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

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

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

Other hypernyms of boater include chapeau, lid.

boater (noun)	hat (noun)
a stiff hat made of straw with a flat crown	an informal term for a person's role
someone who drives or rides in a boat	headdress that protects the head from bad weather; has shaped crown and usually a brim

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