boater vs sailor

boater and sailor both are nouns.

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

As nouns, boater and sailor are synonyms defined as:

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

boater (noun)	sailor (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	any member of a ship's crew
	a serviceman in the navy