- stoolpigeon
- snitcher
- sneak
- supergrass
- sneaker
- snitch
- solmizate
- sing a different song
- sing a different tune
- sing along
- sinfulness
- sing up
- sing of
- shoot the breeze
- speech disorder
- split hairs
- squabbler
- sorehead
- straightway
- sharp(ly)
- speer
- speedy
- straight_out
- straightaway
- skillet cake
- sum term
- speedskater
- sum
- sultry weather
- sum of products expression
- sum and substance
- short iliary nerve
- spasmodic laryngitis
- singularly
- sally
- sallow earthy tint
- self_sacrifice
- selflessness
- startling
- shortness
- spoke
- spokane
- semiepiphyte
- skiffle group
- skip row planting
- small stove
- slot die extrusion
- slot
- slot reader
- stone_pestle