remission of sin vs absolution

remission of sin and absolution both are nouns.

Word	Noun	Adjective	Verb	Adverb
remission of sin	Yes	No	No	No
absolution	Yes	No	No	No

As nouns, remission of sin and absolution are synonyms defined as:

remission of sin and absolution: the act of absolving or remitting; formal redemption as pronounced by a priest in the sacrament of penance

Other synonyms of remission of sin include remission, remittal.

remission of sin (noun)	absolution (noun)
the act of absolving or remitting; formal redemption as pronounced by a priest in the sacrament of penance	the act of absolving or remitting; formal redemption as pronounced by a priest in the sacrament of penance
	the condition of being formally forgiven by a priest in the sacrament of penance