oology vs zoological science

oology and zoological science both are nouns.

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

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

oology: the branch of zoology that studies eggs (especially birds' eggs and their size, shape, coloration, and number)
zoological science: the branch of biology that studies animals

Other hypernyms of oology include zoology.

oology (noun)	zoological science (noun)
the branch of zoology that studies eggs (especially birds' eggs and their size, shape, coloration, and number)	the branch of biology that studies animals