biology vs diurnal

biology is a noun but diurnal is not a noun.

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

biology (noun)	diurnal (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)	diurnal (adjective)
	of or belonging to or active during the day
	having a daily cycle or occurring every day