satisfaction vs expiation

satisfaction and expiation both are nouns.

Word	Noun	Adjective	Verb	Adverb
satisfaction	Yes	No	No	No
expiation	Yes	No	No	No

As nouns, satisfaction and expiation are synonyms defined as:

Other synonyms of satisfaction include atonement.

satisfaction (noun)	expiation (noun)
act of fulfilling a desire or need or appetite	the act of atoning for sin or wrongdoing (especially appeasing a deity)
the contentment one feels when one has fulfilled a desire, need, or expectation	compensation for a wrong
compensation for a wrong
(law) the payment of a debt or fulfillment of an obligation
state of being gratified or satisfied