Parousia vs Advent

Parousia and Advent both are nouns.

Word	Noun	Adjective	Verb	Adverb
Parousia	Yes	No	No	No
Advent	Yes	No	No	No

As nouns, Parousia and Advent are synonyms defined as:

Parousia and Advent: (Christian theology) the reappearance of Jesus as judge for the Last Judgment

Other synonyms of Parousia include Second Advent, Second Coming, Second Coming of Christ.

Parousia (noun)	Advent (noun)
(Christian theology) the reappearance of Jesus as judge for the Last Judgment	(Christian theology) the reappearance of Jesus as judge for the Last Judgment
	the season including the four Sundays preceding Christmas