antagonise vs antagonism

antagonise is not a noun while antagonism is a noun.

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

antagonise (noun)	antagonism (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

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