- Rock-snake
- Rocket range
- Rocking stone
- Rococo
- Rod
- Rodomont
- Roe
- Roemer
- Roentgen rays
- Rogational
- Rogue
- Rogue elephant
- Roil
- Roland
- Roll bar
- Rolled into one
- Rolled oats
- Roller skate
- Rollick
- Rolling stone
- Rollout
- Roman
- Roman libra
- Romance languages
- Romeo
- Romper
- Rondavels
- Roof slope
- Rookie
- Roominess
- Roommate
- Roomy
- Root and branch
- Root climber
- Root idea
- Root word
- Root-cause
- Root-crop
- Root-parasite
- Rooted
- Rootedness
- Rootless
- Rope
- Rope of sands
- Rope-ladder
- Ropeway
- ropey
- Ropy
- Ros
- Rosary beads
- Rose
- Rose bud
- Rose colour
- Rose without a thorn
- Rostrum
- Rota
- Rotary
- Rottenly
- Rottenness
- Rotting
- Rotund
- Rotunda
- Rotundity
- Roue
- Rough cop
- Rough deal
- Rough hew
- Rough kindness
- Rough luck
- Rough passage
- Rough-house
- Rough-welcome
- Roughage
- Roughness
- Round dozen
- Round number
- Round of bread
- Round peg in square hole
- Round the clock
- Round-shot
- Rounded
- Rounder
- Roundup
- Roundworm
- Rouse
- Rouse one from
- Rousing
- Rousing passion
- Route march
- Routine work
- Routinely
- Roving eye
- Row
- Rowdy
- Rowdyish
- Rowel
- Rowing boat
- Royal families
- Royal grant
- Redaction