- Skep
- Sketchy
- Skeuomorphism
- Skew-whiff
- Skewbald
- Ski
- Skid road
- Skid row
- Skidding
- Skied
- Skier
- Skill
- Skilled
- Skillful
- Skim over
- Skimmer
- Skimpingly
- Skimply
- Skulduggery
- Skin and bone
- Skin disease
- Skin diving
- Skin head
- Skinned
- Skinner
- Skinny dip
- Skip about
- Skipping
- Skipping rope
- Skirt
- Skirted
- Skivvy
- Skulk
- Skull
- Skull and cross bones
- Skulls
- Skumming off
- Sky
- Sky-born
- Sky-troops
- Skype
- Skywards
- Slabber
- Slabbiness
- Slack away
- Slack-water
- Slacken
- Slackening
- Slithery
- Slain
- Slake
- Slanderously
- Slanderousness
- Slanging match
- Slangy
- Slap-up
- Slapdash
- Slashing
- Slate-coloured
- Slate-pencil
- Slaughter
- Slaughterer
- Slave girl
- Slaver
- Slavering
- Slaves
- Slavishness
- Slavonic
- Slayer
- Slaying
- Sledger
- Sledging
- Sleek-headed
- Sleep like a log
- Sleep-walker
- Sleeping beauty
- Sleeping car
- Sleeping partner
- Sleeplessness
- Sleepy
- Sleeve-link
- Sliced
- Slicker
- Slide
- Slight heat
- Slight over
- Slightingly
- Slightish
- Slightly acidic
- Sliminess
- Slimming exercises
- Sling
- Slingshot
- Slip of the tongue
- Slip up
- Slipped disc
- Slipperily
- Slippery
- Slit
- Slive