calming vs propitiation

calming and propitiation both are nouns.

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

As nouns, propitiation is a hyponym of calming; that is, propitiation is a word with a more specific, narrower meaning than calming:

Other hyponyms of calming include mollification, pacification, conciliation, placation.

calming (noun)	propitiation (noun)
the act of appeasing (as by acceding to the demands of)	the act of placating and overcoming distrust and animosity
	the act of atoning for sin or wrongdoing (especially appeasing a deity)