- Swelling
- Swelling up
- Swelter
- Sweltering
- Sylph
- Swept and garnished
- Swerve
- Swiflty
- Swift
- Swift motion
- Swift-running animal
- Swift-winged
- Swiftly
- Swiftness
- Swig
- Swill
- Swim
- Swim with the tide
- Swim-suit
- Swimmable
- Swimmer
- Swimming
- Swimming bath
- Swimming belt
- Syllabically
- Switched on
- Switcher
- Switcheroo
- Switchman
- Swivel
- Swivel eye
- Swivel joint
- Swollen
- Swollen navel
- Swollen root
- Swooing
- Swoon
- Swooning
- Sword bayonet
- Sword fight
- Sword-arm
- Sword-bearer
- Sword-belt
- Sword-blade
- Sword-fighter
- Sword-stick
- Sword-tip
- Swordfish
- Swordplay
- Swordsman
- Swordsmanship
- Sworn
- Sworn brothers
- Sworn enemies
- Sworn friends
- Swot
- Swot up
- Swum
- Sybarite
- Sybaritic
- Sybaritical
- Sybaritism
- Sycamore
- Sychophant
- Sycophancy
- Sycophant
- Sycophantic
- Sycosis
- Symptomatically
- Symptomatology
- Symptoms
- Synagogal
- Synagogical
- Synagogue
- Synapse
- Synartesis
- Sync
- Synchromesh
- Synchronism
- Synchronistic
- Synchronization
- Synchronize
- Synchronous
- Synchronously
- Synchrony
- Syncopated
- Syncopation
- Syncope
- Syncretic
- Syncretism
- Syndicalism
- Syndicalist
- Syndicate
- Syndication
- Syndrome
- Syndromic
- Synergy
- Synod
- Synodic
- Synodic period