biological science vs biology

biological science and biology both are nouns.

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

As nouns, biological science and biology are synonyms defined as:

biological science and biology: the science that studies living organisms

biological science (noun)	biology (noun)
the science that studies living organisms	the science that studies living organisms
	all the plant and animal life of a particular region
	characteristic life processes and phenomena of living organisms