millenarian vs chiliastic

millenarian is a noun but chiliastic is not a noun.

Word	Noun	Adjective	Verb	Adverb
millenarian	Yes	Yes	No	No
chiliastic	No	Yes	No	No

As adjectives, millenarian and chiliastic are synonyms defined as:

millenarian and chiliastic: relating to or believing in the millennium of peace and happiness

millenarian (noun)	chiliastic (noun)
a person who believes in the coming of the millennium (a time of great peace and prosperity)

millenarian (adjective)	chiliastic (adjective)
relating to or believing in the millennium of peace and happiness	relating to or believing in the millennium of peace and happiness