biology vs downy

biology is a noun but downy is not a noun.

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

biology (noun)	downy (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)	downy (adjective)
	covered with fine soft hairs or down
	like down or as soft as down