bunny girl vs bunny

bunny girl and bunny both are nouns.

Word	Noun	Adjective	Verb	Adverb
bunny girl	Yes	No	No	No
bunny	Yes	No	No	No

As nouns, bunny girl and bunny are synonyms defined as:

bunny girl and bunny: a young waitress in a nightclub whose costume includes the tail and ears of a rabbit

bunny girl (noun)	bunny (noun)
a young waitress in a nightclub whose costume includes the tail and ears of a rabbit	(usually informal) especially a young rabbit
	a young waitress in a nightclub whose costume includes the tail and ears of a rabbit