deciduous vs plant life

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

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

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

deciduous (adjective)	plant life (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