biological science vs diurnal

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

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

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

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