millenarism vs millenarianism

millenarism and millenarianism both are nouns.

Word	Noun	Adjective	Verb	Adverb
millenarism	Yes	No	No	No
millenarianism	Yes	No	No	No

As nouns, millenarism and millenarianism are synonyms defined as:

millenarism and millenarianism: belief in the Christian doctrine of the millennium mentioned in the Book of Revelations

Other synonyms of millenarism include chiliasm, millenniumism.

millenarism (noun)	millenarianism (noun)
belief in the Christian doctrine of the millennium mentioned in the Book of Revelations	belief in the Christian doctrine of the millennium mentioned in the Book of Revelations