chiliasm vs millenarianism

chiliasm and millenarianism both are nouns.

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

As nouns, chiliasm and millenarianism are synonyms defined as:

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

Other synonyms of chiliasm include millenarism, millenniumism.

chiliasm (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