nocturnal vs biology

nocturnal is not a noun while biology is a noun.

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

nocturnal (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

nocturnal (adjective)	biology (adjective)
belonging to or active during the night
of or relating to or occurring in the night