Second Coming of Christ vs Advent

Second Coming of Christ and Advent both are nouns.

Word	Noun	Adjective	Verb	Adverb
Second Coming of Christ	Yes	No	No	No
Advent	Yes	No	No	No

As nouns, Second Coming of Christ and Advent are synonyms defined as:

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

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

Second Coming of Christ (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