Second Advent vs Second Coming of Christ

Second Advent and Second Coming of Christ both are nouns.

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

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

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

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

Second Advent (noun)	Second Coming of Christ (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