cell theory vs biological science

cell theory and biological science both are nouns.

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

cell theory (noun)	biological science (noun)
(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	the science that studies living organisms