- spin(ning)
- Spanish chestnut
- sweet chestnut
- squirming
- swamp cottonwood
- sylvilagus palustris
- sylvilagus aquaticus
- swamp hare
- swamp rabbit
- silky cornel
- silky dogwood
- sceloporus occidentalis
- sciurus vulgaris
- sciurus hudsonicus
- Sciurus griseus
- Sonora semiannulata
- Storeria occipitamaculata
- sand snake
- spruce grouse
- silverback
- saligenin
- serotine
- SPipistrellus hesperus
- santiago
- slender salamander
- Statistical Commission
- shakeout
- Social Development Commission
- sticktight flea
- suckerfish
- sucking fish
- sharksucker
- southwestern white pine
- sheepshearing
- seedtime
- social season
- sluttish
- straight_forward
- slowly but surely
- smuggling
- seventy_four
- sexually excited
- sofia scicolone
- sonant
- sitting elbow test height
- shovel_shaped incisor
- shovel hat
- stratification
- sorting algorithm
- sorting and sifting