- record type
- run low
- reticulothalamic tract
- repartee
- rhodes scholar
- rhodesian
- rearwards
- round_bottom
- round_faced
- round_bottomed
- reformat
- rose_tinged
- rose_tinted
- reddish_gray
- reddish_grey
- reddish_lavender
- red_gray
- red_grey
- red_lavender
- red_lead putty
- red letter day
- Ring of Fire
- Rajanya
- Rosebush
- Relative In Law
- Radial-ply
- Rolling-stock
- Roof-rack
- Rose-water
- Raptures
- Ratiocinate
- Re-create
- Retrieving
- Returns
- Ricocheted
- Riff-raff
- Right-angled triangle
- River-bed
- Riparian
- Rocking-chair
- Rock-cake
- Rip-roaring
- Re-election
- Right-hander
- Rigout
- Red-blooded
- Rifle-range
- Reef-knot
- Ready-made
- Record-breaking