zoology vs ethology

zoology and ethology both are nouns.

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

As nouns, ethology is a hyponym of zoology; that is, ethology is a word with a more specific, narrower meaning than zoology:

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

zoology (noun)	ethology (noun)
the branch of biology that studies animals	the branch of zoology that studies the behavior of animals in their natural habitats
all the animal life in a particular region or period