御休みなさい[oyasuminasai] good night
ひと休み[hitoyasumi] rest
運休[unkyuu] service suspended (e.g. trains)
夏季休暇[kakikyuuka] summer vacation
夏休み[natsuyasumi] summer vacation

閑話休題[kanwakyuudai] Now let's return to the main subject
休め[yasume] (Stand) at ease!
気休め[kiyasume] mere consolation
気休めに[kiyasumeni] for peace of mind
休する[kyuusuru] to come to an end

休憩[kyuukei] rest
休憩時間[kyuukeijikan] rest time
休憩室[kyuukeishitsu] break room
休憩所[kyuukeijo] rest area
憩う[ikou] to rest

少憩[shoukei] short rest
憩室[keishitsu] diverticulum
小憩[shoukei] a short break or breather
憩いの場[ikoinoba] place for relaxation and refreshment