13 letters
- somnambulisms28
- spasmodically27
- spiritualisms21
- spokesmanship29
- sportsmanlike25
- sportsmanship25
- standpattisms21
- statesmanlike22
- statesmanship22
- structuralism22
- subjectivisms36
- superorganism23
- superrealisms21
- supersalesman22
- supersalesmen22
- swordsmanship26
- sycophantisms27
- symmetallisms26
- syndactylisms26
- televangelism25
- theatricalism22
- theocentrisms22
- thermotropism24
- thigmotropism26
- toxoplasmoses27
- toxoplasmosis27
- transmembrane24
- transmigrated20
- transmigrates19
- transmigrator19
- transmissible21
- transmissions18
- transmittable21
- transmittance21
- transmountain20
- transmutation19
- transmutative22
- transvestisms21
- trichromatism24
- triliteralism18
- triumphalisms26
- ultraleftisms22
- ultrarealisms19
- uncharismatic26
- underclassman24
- underclassmen24
- unitarianisms19
- universalisms23
- upperclassman28
- upperclassmen28
- vegetarianism23
- ventriloquism32
- vernacularism26
- vocationalism25
- voluntaryisms25
- volunteerisms23