pilous vs biology

pilous is not a noun while biology is a noun.

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

pilous (noun)	biology (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

pilous (adjective)	biology (adjective)
covered with hairs especially fine soft ones