tastebud vs gustatory organ

tastebud and gustatory organ both are nouns.

Word	Noun	Adjective	Verb	Adverb
tastebud	Yes	No	No	No
gustatory organ	Yes	No	No	No

As nouns, tastebud and gustatory organ are synonyms defined as:

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

Other synonyms of tastebud include taste bud.

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