millenarianism vs millenarism

millenarianism and millenarism both are nouns.

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

As nouns, millenarianism and millenarism are synonyms defined as:

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

Other synonyms of millenarianism include chiliasm, millenniumism.

millenarianism (noun)	millenarism (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