zoology vs biological science

zoology and biological science both are nouns.

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

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

Other hypernyms of zoology include biology.

zoology (noun)	biological science (noun)
the branch of biology that studies animals	the science that studies living organisms
all the animal life in a particular region or period