ethology vs zoological science

ethology and zoological science both are nouns.

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

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

ethology: the branch of zoology that studies the behavior of animals in their natural habitats
zoological science: the branch of biology that studies animals

Other hypernyms of ethology include zoology.

ethology (noun)	zoological science (noun)
the branch of zoology that studies the behavior of animals in their natural habitats	the branch of biology that studies animals