expiation vs restitution

expiation and restitution both are nouns.

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

As nouns, restitution is a hypernym of expiation; that is, restitution is a word with a broader meaning than expiation:

Other hypernyms of expiation include amends, damages, indemnification, indemnity, redress.

expiation (noun)	restitution (noun)
the act of atoning for sin or wrongdoing (especially appeasing a deity)	getting something back again
compensation for a wrong	the act of restoring something to its original state
	a sum of money paid in compensation for loss or injury