dorsal vs biological science

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

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

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

dorsal (adjective)	biological science (adjective)
belonging to or on or near the back or upper surface of an animal or organ or part
facing away from the axis of an organ or organism