hostility vs antagonism

hostility and antagonism both are nouns.

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

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

As nouns, hostility and antagonism are synonyms defined as:

Other synonyms of hostility include enmity.

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