propitiation vs placation

propitiation and placation both are nouns.

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

As nouns, propitiation and placation are synonyms defined as:

propitiation and placation: the act of placating and overcoming distrust and animosity

Other synonyms of propitiation include conciliation.

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