repose vs placidity

repose and placidity both are nouns.

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

As nouns, repose and placidity are synonyms defined as:

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

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

repose (verb)	placidity (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