あんそく
noun
rest; repose; peace
emotion
1. rest; repose; quiet peace
A state of calm rest in which the mind and body are at ease, free from worry or labor. A somewhat literary word, often with spiritual or religious overtones.
安息(あんそく)(とき)()ごす
To spend a time of repose.
My family home is a place of peace for me.
After a long battle with illness, he finally found peace.

Literary in tone; in everyday speech 休息(きゅうそく) (rest) is more common.

Common collocations

Note: 安息日(あんそくび/あんそくにち) means the Sabbath, the religious day of rest.