diurnal vs biological science

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

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

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

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