crew cut vs flattop

crew cut and flattop both are nouns.

Word	Noun	Adjective	Verb	Adverb
crew cut	Yes	No	No	No
flattop	Yes	No	No	No

As nouns, crew cut and flattop are synonyms defined as:

crew cut and flattop: a closely cropped haircut; usually for men or boys

Other synonyms of crew cut include butch.

crew cut (noun)	flattop (noun)
a closely cropped haircut; usually for men or boys	a large warship that carries planes and has a long flat deck for takeoffs and landings
	a closely cropped haircut; usually for men or boys