oology vs zoology

oology and zoology both are nouns.

Word	Noun	Adjective	Verb	Adverb
oology	Yes	No	No	No
zoology	Yes	No	No	No

As nouns, zoology is a hypernym of oology; that is, zoology 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)
zoology: the branch of biology that studies animals

Other hypernyms of oology include zoological science.

oology (noun)	zoology (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
	all the animal life in a particular region or period