animosity vs hostility

animosity and hostility both are nouns.

Word	Noun	Adjective	Verb	Adverb
animosity	Yes	No	No	No
hostility	Yes	No	No	No

As nouns, hostility is a hypernym of animosity; that is, hostility is a word with a broader meaning than animosity:

Other hypernyms of animosity include enmity, ill will.

animosity (noun)	hostility (noun)
a feeling of ill will arousing active hostility	violent action that is hostile and usually unprovoked
	a hostile (very unfriendly) disposition
	the feeling of a hostile person
	a state of deep-seated ill-will