S: (n) ceiling (the overhead upper surface of a covered space) "he hated painting the ceiling"
S: (n) floor, flooring (the inside lower horizontal surface (as of a room, hallway, tent, or other structure)) "they needed rugs to cover the bare floors"; "we spread our sleeping bags on the dry floor of the tent"
S: (n) room light (light that provides general illumination for a room)
S: (n) wall (an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure) "the south wall had a small window"; "the walls were covered with pictures"
S: (n) building, edifice (a structure that has a roof and walls and stands more or less permanently in one place) "there was a three-story building on the corner"; "it was an imposing edifice"