propitiation vs atonement

propitiation and atonement both are nouns.

Word	Noun	Adjective	Verb	Adverb
propitiation	Yes	No	No	No
atonement	Yes	No	No	No

As nouns, propitiation and atonement are synonyms defined as:

propitiation and atonement: the act of atoning for sin or wrongdoing (especially appeasing a deity)

Other synonyms of propitiation include expiation.

propitiation (noun)	atonement (noun)
the act of placating and overcoming distrust and animosity	the act of atoning for sin or wrongdoing (especially appeasing a deity)
the act of atoning for sin or wrongdoing (especially appeasing a deity)	compensation for a wrong