antagonism vs ill will

antagonism and ill will both are nouns.

Word	Noun	Adjective	Verb	Adverb
antagonism	Yes	No	No	No
ill will	Yes	No	No	No

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

Other hypernyms of antagonism include dislike, enmity, hostility.

antagonism (noun)	ill will (noun)
(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