chiliastic vs millenarian

chiliastic is not a noun while millenarian is a noun.

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

As adjectives, chiliastic and millenarian are synonyms defined as:

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

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

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