bunny vs bunny girl

bunny and bunny girl both are nouns.

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

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

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

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