bicuspid vs bicuspidate

bicuspid is a noun but bicuspidate is not a noun.

Word	Noun	Adjective	Verb	Adverb
bicuspid	Yes	Yes	No	No
bicuspidate	No	Yes	No	No

As adjectives, bicuspid and bicuspidate are synonyms defined as:

bicuspid and bicuspidate: having two cusps or points (especially a molar tooth)

bicuspid (noun)	bicuspidate (noun)
a tooth having two cusps or points; located between the incisors and the molars

bicuspid (adjective)	bicuspidate (adjective)
having two cusps or points (especially a molar tooth)	having two cusps or points (especially a molar tooth)