- roof types
- roof weir
- roofer pitch
- roofing application
- roofing felt
- roofing glass
- roofing screw
- roofing spike
- room index
- room width
- rope cap
- rope hauling
- rope ladder
- rope sheave
- ropeway pylon
- rosace
- rose
- rose window
- rostrum
- rotary device
- rotary drier
- rotary dryer
- rotary fan
- rotary loader
- rotary press
- rotary pump
- rotary saw
- rotary shear
- rotary tool
- rotatory motion
- rouge
- rough
- rough concrete
- rough draft
- rough dressing
- rough estimate
- rough finishing
- rough ground
- rough hardware
- rough hewing
- rough mold
- rough plank
- rough stone
- rough surface
- rough table
- rough track
- rough wood
- rough-down
- rough-hew
- rough-machined
- roughcast
- roughening treatment
- rougher floatation
- round
- round brush
- round off
- round pliers
- round sagger
- rolling
- rolling bearing
- rolling center
- rolling circle
- rolling door
- rolling load
- rolling noise
- rolling partition
- rolling shutter
- rolling weir
- rolling work
- rollingbridge
- Roman cement
- Roman school
- Roman style
- romance
- romanesque
- romanticism
- romex connector
- rood beam
- roof
- roof aggregate
- roof arch
- roof battening
- roof beam
- roof bolting
- roof bracing
- roof crane
- roof exposure
- roof fan
- roof form
- roof framing
- roof garden
- roof loading
- roof membrane
- roof ridge
- roof saddle
- roof span
- roof tie
- roof ventilator
- roof work
- roofage