antagonism vs hostility

antagonism and hostility both are nouns.

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

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

Other hypernyms of antagonism include dislike, enmity, ill will.

As nouns, antagonism and hostility are synonyms defined as:

Other synonyms of antagonism include enmity.

antagonism (noun)	hostility (noun)
(biochemistry) interference in or inhibition of the physiological action of a chemical substance by another having a similar structure	violent action that is hostile and usually unprovoked
an actively expressed feeling of dislike and hostility	a hostile (very unfriendly) disposition
the relation between opposing principles or forces or factors	the feeling of a hostile person
a state of deep-seated ill-will	a state of deep-seated ill-will