deaden vs plant life

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

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

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

deaden (verb)	plant life (verb)
become lifeless, less lively, intense, or active; lose life, force, or vigor
make less lively, intense, or vigorous; impair in vigor, force, activity, or sensation
lessen the momentum or velocity of
make vapid or deprive of spirit
convert (metallic mercury) into a grey powder consisting of minute globules, as by shaking with chalk or fatty oil
make vague or obscure or make (an image) less visible
cut a girdle around so as to kill by interrupting the circulation of water and nutrients