biology vs canescent

biology is a noun but canescent is not a noun.

Word	Noun	Adjective	Verb	Adverb
biology	Yes	No	No	No
canescent	No	Yes	No	No

biology (noun)	canescent (noun)
the science that studies living organisms
all the plant and animal life of a particular region
characteristic life processes and phenomena of living organisms

biology (adjective)	canescent (adjective)
	of greyish white
	covered with fine whitish hairs or down