- Sleeping coach
- Sleeping draught
- Sleeping partner
- Sleeping pill
- Sleeping policeman
- Sleeping sickness
- Sleeping suit
- Sleepish
- Sleepless
- Sleeplessly
- Sleeplessness
- Slighting
- Slightingly
- Slightish
- Slightly
- Slightly acidic
- Slightly covered-up hole
- Slightly sour
- Slightness
- Slim
- Slime
- Sliminess
- Slimming
- Slimming exercises
- Slimmish
- Slimy
- Sling
- Sling ink
- Sling ones hook
- Slinger
- Slingshot
- Slink
- Slinky
- Slip
- Slip down
- Slip of the tongue
- Slip off
- Slip stream
- Slip up
- Slip-knot
- Slippage
- Slipped disc
- Slipped off
- Slipper
- Slipperily
- Slipperiness
- Slippers
- Slippery
- Slippery ground
- Slipping
- Slipping down
- Slipping off
- Slipshod
- Slow but sure
- Slow down
- Slumdog
- Slow march
- Slow motion
- Slow neutron
- Slow poison
- Slow reactor
- Slow tempo
- Slow up
- Slow worm
- Slow-moving
- Slow-sighted
- Slow-witted
- Slowing
- Slowish
- Slowishly
- Slowishness
- Slowly
- Slowness
- Slowpoke
- Slsi
- Slt
- Slubber
- Slubberdegullion
- Slubbering
- Slubberingly
- Sludge
- Sludger
- Sludgy
- Slug
- Slugfest
- Sluggard
- Slugged
- Sluggish
- Sluggishly
- Sluggishness
- Sluice
- Sluice-gate
- Sluicy
- Sluit
- Slum
- Slum clearance
- Slum dwellers
- Small country boat
- Small cowry
- Small craft