zoological science vs zoology

zoological science and zoology both are nouns.

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

As nouns, zoological science and zoology are synonyms defined as:

zoological science and zoology: the branch of biology that studies animals

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