- sun-dog
- sunburn
- sunless
- super
- super sensible
- super sopper
- superannuated
- supercharge
- superficial
- superficially
- superlative
- supersonic jet plane
- supervision
- supervisor
- suppliant
- supply
- supposer
- suppressant
- supremacy
- surface
- surname
- surrogate
- surrounding filaments
- sustain loss
- sustainable development
- swamp
- swashbuckling
- swearing
- sweet pea
- swill
- swing
- swing wing
- sworn enemies
- sycophant
- symmetric
- symmetry
- symphony
- symptomatic
- syncretic
- syneresis
- synonym
- synoptic gospels
- syphilitic
- sysgen
- split hairs
- science
- search
- skin
- sysop
- submissive
- sparc
- sit by
- salve
- sell someone down the river
- shuttlecock
- sac
- sackcloth
- sale
- salutary
- salvation
- sample
- sanctum
- sap
- sarcastic
- say-so
- scarce
- scarf
- scarper
- scented
- schism
- schmaltzy
- scout
- scientific
- scoff
- shock
- standard model
- scribe
- searing
- seasoned
- seating
- second
- second-rate
- secrete
- see about
- see
- see to
- seedy
- seek
- seer
- self-evident
- self-possessed
- send-up
- sensitive
- separate
- side
- service
- sword-stick
- set
- settlement
- sieve