zoological science vs biology

zoological science and biology both are nouns.

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

As nouns, biology is a hypernym of zoological science; that is, biology is a word with a broader meaning than zoological science:

Other hypernyms of zoological science include biological science.

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