Open English Wordnet
Nouns
(n)rest, ease, repose, relaxationfreedom from activity (work or strain or responsibility)“took his repose by the swimming pool”
(n)peace, peacefulness, peace of mind, repose, serenity, heartsease, ataraxisthe absence of mental stress or anxiety
(n)repose, quiet, placidity, serenity, tranquillity, tranquilitya disposition free from stress or emotion