boater vs straw hat

boater and straw hat both are nouns.

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

As nouns, boater and straw hat are synonyms defined as:

Other synonyms of boater include leghorn, Panama, Panama hat, sailor, skimmer.

boater (noun)	straw hat (noun)
a stiff hat made of straw with a flat crown	a stiff hat made of straw with a flat crown
someone who drives or rides in a boat