幽す[yuusu] to confine to a room
幽闇[yuuan] gloom
幽雅[yuuga] refinement
幽界[yuukai] hades
幽閑[yuukan] quiet and secluded

幽鬼[yuuki] ghost
幽客[yuukaku] orchid
幽居[yuukyo] hermitage
幽境[yuukyou] solitude
幽契[yuukei] secret promise made to the gods

鳥竜茶[uuroncha] oolong tea
愛鳥[aichou] pet bird
鳥渡[choto] just a minute
一石二鳥[issekinichou] killing two birds with one stone
益鳥[ekichou] beneficial bird

黄鳥[kouchou] Japanese bush warbler (Cettia diphone)
伽藍鳥[garanchou] pelican
火食鳥[hikuidori] cassowary (Casuarius spp.)
花鳥[kachou] flowers and birds
花鳥風月[kachoufuugetsu] beauties of nature