plant life vs deciduous

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

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

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

plant life (adjective)	deciduous (adjective)
	(of plants and shrubs) shedding foliage at the end of the growing season
	(of teeth, antlers, etc.) being shed at the end of a period of growth