biological science vs cell theory

biological science and cell theory both are nouns.

Word	Noun	Adjective	Verb	Adverb
biological science	Yes	No	No	No
cell theory	Yes	No	No	No

biological science (noun)	cell theory (noun)
the science that studies living organisms	(biology) the theory that cells form the fundamental structural and functional units of all living organisms; proposed in 1838 by Matthias Schleiden and by Theodor Schwann