biological science vs canescent

biological science is a noun but canescent is not a noun.

Word	Noun	Adjective	Verb	Adverb
biological science	Yes	No	No	No
canescent	No	Yes	No	No

biological science (noun)	canescent (noun)
the science that studies living organisms

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