gustatory organ vs taste bud

gustatory organ and taste bud both are nouns.

Word	Noun	Adjective	Verb	Adverb
gustatory organ	Yes	No	No	No
taste bud	Yes	No	No	No

As nouns, gustatory organ and taste bud are synonyms defined as:

gustatory organ and taste bud: an oval sensory end organ on the surface of the tongue

Other synonyms of gustatory organ include tastebud.

gustatory organ (noun)	taste bud (noun)
an oval sensory end organ on the surface of the tongue	an oval sensory end organ on the surface of the tongue