- sidekick
- siege
- silk
- simoleon
- simp
- simulcast
- sharkskin
- sharp
- shaven
- shear
- sheer
- sheriff
- shir
- shirr
- short commons
- shot
- shown
- shoe-parlor
- shoestring
- shone
- shop
- shorn
- show
- shut
- shut-eye
- singlesticker
- sinister
- siding
- sissy
- skate
- skeletonise
- skeletonize
- slack
- slant
- slating
- sleek
- sleighing
- sluggard
- slush fund
- smacker
- small-time
- smart aleck
- smear
- smidgen
- smooth
- skid
- skid row
- skiddoo
- skillet
- skin magazine
- skoal
- skulduggery
- skull session
- skullduggery
- skunk
- sky truck
- slap-happy
- slapjack
- slashing
- slather
- slaw
- sleuth
- snatch
- snip
- snipe
- snoot
- snooty
- snow bunting
- snow-bird
- soak
- soda jerk
- soda-fountain
- slam
- slate
- slaver
- sledding
- sling
- smart-alecky
- smoke
- slip
- slop
- slugger
- small-town
- smug
- snell
- snippet
- snippy
- snit
- snob
- snootiness
- snow
- snug
- soap-boxer
- sob-sister
- snake
- snap
- snoop
- snort
- snottiness
- snuff