antagonism vs antagonise

antagonism is a noun but antagonise is not a noun.

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

antagonism (noun)	antagonise (noun)
(biochemistry) interference in or inhibition of the physiological action of a chemical substance by another having a similar structure
an actively expressed feeling of dislike and hostility
the relation between opposing principles or forces or factors
a state of deep-seated ill-will

antagonism (verb)	antagonise (verb)
	provoke the hostility of
	act in opposition to