- ragtag
- raccoon
- racetrack
- rabies
- racecourse
- racing
- rabelaisian
- rack railway
- racking
- rackety
- racquet
- radicalism
- radically
- radio aerial
- radio beam
- radio compass
- racially
- radiator
- radio operator
- radio receiver
- radar
- radial
- radial symmetry
- radiant
- radiate
- radioactive
- radioactivity
- rafter
- raftsman
- racialism
- racism
- racketeering
- ragtime
- railroad
- railroader
- railway
- railway line
- rainfall
- rainwater
- rainy
- racial
- radiation
- racketeer
- radio
- radiation sickness
- radiogram
- radius vector
- raffle
- ragamuffin
- rage