- ruggelach
- ruhr river
- run away together
- run away with
- run close
- run before can walk
- run high
- run dry
- run batted in
- run deep
- run off with
- run past
- run off together
- run roughshod
- run over
- run risks
- run round in small circles
- run round in circles
- ruination
- ruining
- ruinous
- rule in
- rule of grammar
- rule of cy pres
- rule book
- rule of evidence
- rule of morphology
- rule of law
- rule of thumb
- ruling class
- ruling
- rules of the road
- rum_blossom
- rum cherry
- rumble seat
- rumbling or thundering sound
- rumex acetosa
- rumen
- rumex scutatus
- rumex acetosella
- ruminantia
- rumex obtusifolius
- rumination
- ruminator
- rummage
- rummy—a game of playing cards
- rumohra
- rump roast
- run a temperature
- rumpelstiltskin