bell-bottoms vs bellbottom trousers

bell-bottoms and bellbottom trousers both are nouns.

Word	Noun	Adjective	Verb	Adverb
bell-bottoms	Yes	No	No	No
bellbottom trousers	Yes	No	No	No

As nouns, bell-bottoms and bellbottom trousers are synonyms defined as:

bell-bottoms and bellbottom trousers: (used in the plural) trousers with legs that flare; worn by sailors; absurdly wide hems were fashionable in the 1960s

Other synonyms of bell-bottoms include bellbottom pants.

bell-bottoms (noun)	bellbottom trousers (noun)
(used in the plural) trousers with legs that flare; worn by sailors; absurdly wide hems were fashionable in the 1960s	(used in the plural) trousers with legs that flare; worn by sailors; absurdly wide hems were fashionable in the 1960s