Common Words:
* SACK
* SAFE
* SAID
* SALE
* SALT
* SAME
* SAND
* SANE
* SAVE
* SEAT
* SEEN
* SELL
* SEND
* SERE
* SHOE
* SHOT
* SHOW
* SHUT
* SIGN
* SINK
* SLIP
* SLOW
* SMUG
* SNOW
* SOAK
* SOAR
* SOCK
* SOFT
* SOLD
* SOME
* SONG
* SORT
* SOUL
* SOUND
* SPIT
* STOP
* STRA
* STUN
* SUCH
* SURE
* SWIM
Less Common Words:
* SCAD
* SCAM
* SCAR
* SCAT
* SCOG
* SCOT
* SCOW
* SCUD
* SEAM
* SEAR
* SEED
* SEEK
* SEEP
* SELF
* SELL
* SEND
* SERE
* SHAM
* SHAN
* SHAT
* SHAW
* SHEA
* SHOO
* SICK
* SIDE
* SIGH
* SILK
* SILL
* SINE
* SING
* SIRE
* SISS
* SLAB
* SLAP
* SLAT
* SLEW
* SLIM
* SLIT
* SLOB
* SLOT
* SLOW
* SLUG
* SMOG
* SNAP
* SNUG
* SOAR
* SOAP
* SODA
* SOFA
* SOIL
* SOLD
* SOLE
* SOLO
* SOME
* SONG
* SOON
* SOOT
* SOUR
* SPAD
* SPAN
* SPAR
* SPAW
* SPEC
* SPIT
* SPOD
* SPOT
* SPUD
* SPUR
* STAB
* STAG
* STAN
* STAR
* STAY
* STEM
* STEW
* STIR
* STOP
* STOW
* STUB
* STUD
* SUCH
* SUCK
* SUE
* SUG
* SUIT
* SUM
* SUN
* SUP
* SURF
* SWAG
* SWAM
* SWAN
This list includes common words and some less common words, as well as words that might be considered slang or informal.