plant life vs ungregarious

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

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

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

plant life (adjective)	ungregarious (adjective)
	(of animals) not gregarious
	(of plants) growing together in groups that are not close together
	not disposed to seek company