S
- Sans - (a place-name element) holy (as in "Pensans", Penzance)
- Scat - to hit or break "scat abroad = smashed up"; musical beat ('e's two scats behind); "bal scat" is a disused mine (from Cornish language scattra)
- Scaw - elder tree
- Screech - to cry loudly
- Shippon - farm building for livestock (derived from 'sheep' 'pen')
- Shram - chill (as in "shrammed as a winnard")
- Slab - a Cornish range
- Slock - to coax, entice or tempt "slock 'un 'round"
- Small coal / slack - coal dust; "slack" only in the far south west
- Smeech - Acrid smoke (also used as a verb 'to smeech')
- Some - very, extremely (as in "'e d' look some wisht", "'tis some hot today")
- Sowpig - woodlouse
- Spence - larder in house; "crowded = House full, spence full"
- Splatt - patch of grass
- Spriggan - spirit
- Squall - to cry
- Squallass, squallyass - crybaby
- Stagged - muddy
- Stank - to walk, also a word for a long walk as in "that was a fair old stank" (from Cornish language stankya)
- Steen - stoneware pot
- Steeved - frozen
- Stripped up - dressed appropriately
- Stroyl - couch grass (from Cornish language stroylek 'messy')
- Stuggy - broad and sturdy (of a person's build)
- Swale - to burn (moorland vegetation) to bring on new growth
Read more about this topic: List Of Cornish Dialect Words