ecological vs biological science

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

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

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

ecological (adjective)	biological science (adjective)
of or relating to the science of ecology
characterized by the interdependence of living organisms in an environment