plant life vs tall-growing

plant life is a noun but tall-growing is not a noun.

Word	Noun	Adjective	Verb	Adverb
plant life	Yes	No	No	No
tall-growing	No	Yes	No	No

plant life (noun)	tall-growing (noun)
(botany) a living organism lacking the power of locomotion

plant life (adjective)	tall-growing (adjective)
	(of plants) having tall spindly stems