plant life vs gregarious

plant life is a noun but gregarious is not a noun.

Word	Noun	Adjective	Verb	Adverb
plant life	Yes	No	No	No
gregarious	No	Yes	No	No

plant life (noun)	gregarious (noun)
(botany) a living organism lacking the power of locomotion

plant life (adjective)	gregarious (adjective)
	(of animals) tending to form a group with others of the same species
	(of plants) growing in groups that are close together
	instinctively or temperamentally seeking and enjoying the company of others