building
casement
cell
communication
department
detachment
division
dwelling
engineering
equipment
establishment
gap
gleam
hole
house
iron
isolation
ladder
light
machinery
mechanism
metals
mirror
orifice
pipe
place
premises
quadrant
reflection
reflex
residence
reverberation
section
sector
separation
side
staircase
stairs
stairway
technics
technique
technology
trunk
tube
wall
windows