- ribbonfish
- reyes
- rodent
- racehorse
- race horse
- rickettsiosis
- rickettsial disease
- riyal
- radius
- roentgen
- rhythm and blues
- radioactivity unit
- right ascension
- roofy
- Rohypnol
- roach
- rophy
- rope
- radium
- rebate
- radius of curvature
- rebato
- residential district
- residential area
- rac
- rabid
- race meeting
- race relations
- ragtag and bobtail
- ragtag
- raccoon
- rabidness
- raccoon dog
- race against time
- race of arms
- race runner
- race murder
- racegoer
- racetrack
- racer
- racetrack tout
- rachel louise carson
- raw vegetable
- riffraff
- rabble rousing
- rabble_rousing
- rabi i
- rabies
- rabidity
- rabindranath tagore