Merriam-Webster's Collegiate Dictionary:
sloppily
sloppiness
sloppy
sloppy joe
slopwork
slosh
sloshed
sloshy
slot
slot car
slot machine
slot racer
slot racing
slotback
sloth
sloth bear
slothful
slothfully
slothfulness
slotting allowance
slotting fee
slouch
slouch hat
sloucher
slouchily
slouchiness
slouchy
slough
slough of despond
sloughy
slovak
slovakia
slovakian
sloven
slovene
slovenia
slovenian
slovenliness
slovenly
slovensko
slow
slow match
slow motion
slow virus
slow-footed
slow-footedness
slow-motion
slow-pitch
slow-twitch
slow-wave sleep
slow-witted
slowdown
slowish
slowly
slowness
slowpoke
slowworm
slr
slub
slubber
slubbing
sludge
sludgy
slue
sluff
slug
slugabed
slugfest
sluggard
sluggardly
sluggardness
slugger
slugging average
slugging percentage
sluggish
sluggishly
sluggishness
sluice
sluiceway
sluicy
slum
slumber
slumber party
slumberer
slumberous
slumbery
slumbrous
slumgullion
slumlord
slummer
slummy
slump
slumpflation
slung
slungshot
slunk
slur
