aircraft carrier vs flattop

aircraft carrier and flattop both are nouns.

Word	Noun	Adjective	Verb	Adverb
aircraft carrier	Yes	No	No	No
flattop	Yes	No	No	No

As nouns, aircraft carrier and flattop are synonyms defined as:

aircraft carrier and flattop: a large warship that carries planes and has a long flat deck for takeoffs and landings

Other synonyms of aircraft carrier include attack aircraft carrier, carrier.

aircraft carrier (noun)	flattop (noun)
a large warship that carries planes and has a long flat deck for takeoffs and landings	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