placidity vs repose

placidity and repose both are nouns.

Word	Noun	Adjective	Verb	Adverb
placidity	Yes	No	No	No
repose	Yes	No	Yes	No

As nouns, placidity and repose are synonyms defined as:

Other synonyms of placidity include quiet, serenity, tranquility, tranquillity.

placidity (noun)	repose (noun)
a disposition free from stress or emotion	freedom from activity (work or strain or responsibility)
a feeling of calmness; a quiet and undisturbed feeling	a disposition free from stress or emotion
	the absence of mental stress or anxiety

placidity (verb)	repose (verb)
	put or confide something in a person or thing
	lie when dead
	put in a horizontal position
	lean in a comfortable resting position
	to put something (eg trust) in something
	be inherent or innate in