- [ ] sac
- [ ] sacred
- [x] sake
- [ ] salamander
- [ ] salient
- [ ] salmon
- [ ] salon
- [x] sample
- [ ] sanitation
- [ ] sapphire
- [ ] satellite
- [ ] satire
- [ ] satiric
- [ ] saturate
- [x] Saturn
- [ ] sauce
- [x] save
- [x] save up
- [x] scale
- [x] scan
- [x] scar
- [ ] scarce
- [x] scatter
- [ ] scavenger
- [ ] scenery
- [ ] scent
- [x] schedule
- [ ] scheme
- [x] scholar
- [x] scope
- [ ] scorch
- [x] score
- [ ] scout
- [ ] scrape
- [x] scratch
- [x] screen
- [x] script
- [ ] scrub
- [ ] scruffy
- [ ] scuba
- [x] sculpt
- [x] sculpture
- [ ] scurry
- [ ] seal
- [x] secondary
- [ ] secrete
- [x] section
- [x] secure
- [ ] sedentary
- [ ] sediment
- [ ] see to
- [ ] seep
- [ ] segment
- [ ] segregate
- [ ] seismic
- [ ] seismograph
- [ ] seismology
- [x] semester
- [ ] seminar
- [ ] Senate
- [x] senior
- [x] sensible
- [x] sensitive
- [x] sensory
- [ ] sentimental
- [x] separate
- [x] sequence
- [ ] sequoia
- [x] series
- [ ] serve as
- [ ] session
- [ ] set about
- [ ] set aside
- [ ] set on fire
- [ ] set out
- [ ] set up
- [x] setting
- [ ] settle down
- [ ] settlement
- [x] severe
- [ ] sew
- [ ] sewage
- [x] shade
- [ ] shallow
- [x] shatter
- [x] shear
- [ ] shed
- [ ] sheer
- [x] shelter
- [x] shield
- [x] shift
- [ ] shore
- [ ] shortly
- [ ] shovel
- [ ] show off
- [ ] show up
- [x] shower
- [ ] shrimp
- [ ] shroud
- [ ] shrub
- [ ] shuttle
- [ ] sieve
- [x] significantly
- [ ] signify
- [ ] silica
- [ ] silt
- [x] similar
- [ ] simmer
- [x] simply
- [x] simulate
- [ ] simultaneous
- [ ] sinuous
- [x] situated
- [ ] skeletal
- [ ] skeleton
- [ ] skeptical
- [ ] sketch
- [x] skip
- [ ] skull
- [ ] skyscraper
- [ ] sled
- [ ] sledding
- [ ] slender
- [x] slice
- [x] slide
- [ ] slight
- [ ] slip
- [ ] slog
- [ ] slope
- [ ] sloth
- [ ] slumber
- [x] smoothely
- [ ] smother
- [x] snack
- [ ] snap
- [ ] so far
- [ ] so-called
- [x] soccer
- [x] sociology
- [x] soda
- [x] soft
- [x] solar
- [ ] solder
- [ ] sole
- [ ] solicit
- [x] solid
- [ ] solitary
- [x] solo
- [ ] soluble
- [x] solution
- [ ] somewhat
- [ ] soothe
- [ ] sophisticated
- [ ] soprano
- [ ] sore
- [ ] sort out
- [x] sound
- [ ] sour
- [ ] souvenir
- [ ] sow
- [ ] soybean
- [x] space
- [x] span
- [ ] spare
- [x] spark
- [ ] sparse
- [x] spawn
- [x] special
- [x] specialize
- [x] specialized
- [ ] species
- [ ] specify
- [ ] speciment
- [ ] spectacle
- [ ] spectacular
- [ ] spectator
- [x] spectrum
- [ ] speculate
- [ ] spew
- [x] sphere
- [x] spice
- [ ] spill
- [x] spin
- [ ] spinning
- [ ] spiny
- [ ] spiral
- [ ] splash
- [ ] split
- [ ] spoil
- [ ] sponge
- [x] sponsor
- [ ] spontaneity
- [ ] spontaneous
- [ ] spot
- [ ] sprawl
- [ ] spray
- [x] spread
- [x] spring
- [x] spring up
- [ ] sprout
- [ ] spun
- [ ] spur
- [x] square
- [ ] squash
- [ ] squeeze
- [ ] squid
- [ ] squirrel
- [ ] squirt
- [x] stable
- [x] stack
- [ ] stadium
- [x] staff
- [x] stage
- [ ] stagecoach
- [ ] staggered
- [ ] staggering
- [ ] stain
- [ ] stake
- [ ] stalk
- [ ] stand for
- [ ] stand up for
- [x] standard
- [ ] staple
- [ ] starch
- [ ] stark
- [ ] start out
- [ ] startling
- [ ] stash
- [x] state
- [ ] statesman
- [ ] static
- [ ] station
- [ ] stationary
- [x] statistical
- [ ] statue
- [ ] stature
- [ ] status
- [x] stay up
- [ ] steady
- [ ] steep
- [ ] steer
- [ ] stellar
- [ ] stem
- [ ] stem from
- [x] stereo
- [ ] sterile
- [ ] stew
- [ ] stick
- [ ] stick to
- [ ] stick with
- [ ] stiff
- [x] stimulate
- [ ] sting
- [ ] stir
- [x] storage
- [ ] stout
- [ ] straighten up
- [ ] strain
- [ ] strand
- [ ] strap
- [ ] strategy
- [ ] stratum
- [x] stream
- [ ] stress
- [ ] stretch
- [ ] stretch out
- [ ] strict
- [ ] stride
- [x] strike
- [ ] string
- [ ] strip
- [ ] stripe
- [ ] strive
- [ ] stroke
- [x] studio
- [x] stun
- [ ] stunt
- [ ] sturdy
- [ ] stylish
- [ ] stylistic
- [ ] stylized
- [ ] subdue
- [ ] subject
- [ ] submarine
- [ ] submerge
- [x] submit
- [ ] subsequent
- [ ] subsidize
- [ ] subsidy
- [ ] subsist
- [ ] subspecies
- [ ] substance
- [ ] substantial
- [ ] substantiate
- [ ] substitute
- [ ] subtle
- [ ] subtract
- [ ] suburb
- [ ] successive
- [x] suffer from
- [ ] sufficient
- [ ] suffragist
- [ ] suitcase
- [x] sulfur
- [x] sum
- [x] sum up
- [x] summary
- [ ] summit
- [ ] sunlit
- [x] sunset
- [ ] superficial
- [ ] superintendent
- [ ] superior
- [ ] supervise
- [ ] supplant
- [ ] supplement
- [x] suppose
- [ ] suppress
- [ ] supreme
- [ ] surge
- [x] surgeon
- [ ] surpass
- [ ] surplus
- [x] surrender
- [ ] survey
- [x] survive
- [ ] susceptible
- [ ] suspect
- [ ] suspend
- [ ] suspension
- [ ] sustain
- [x] sustained
- [ ] sustenance
- [x] swallow
- [ ] swamp
- [ ] swan
- [ ] swarm
- [ ] swear
- [ ] sweat
- [ ] sweep
- [ ] sweeping
- [ ] swell
- [ ] swift
- [ ] swing
- [x] switch
- [ ] syllable
- [x] symbol
- [x] symbolic
- [ ] symmetry
- [ ] sympathetic
- [x] sympathy
- [x] symphony
- [ ] symptom
- [ ] synonym
- [ ] synthesize
- [ ] synthetic
- [ ] syrup
- [x] systematic