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

円窓[marumado] round window
格子窓[koushimado] latticed window
丸窓[marumado] circular window
車窓[shasou] train window
出窓[demado] bay window

切り窓[kirimado] windows cut out of a wall
窓ごし[madogoshi] viewing through a window
窓口[madoguchi] ticket window
窓際[madogiwa] (at the) window