Mammoth Uncensored Word List:
133 - 12 letter words starting with so

soapolallies soboliferous sociableness socialisable socializable socialnesses sociobiology sociologeses sociological sociologisms sociologists sociometries sociometrist sociopathies sociophobics sockdolagers sockdoligers sockdologers socklessness soddennesses softheadedly sojournments solarimeters solarisation solarization soldierships solecistical solemnifying solemnnesses solenoidally solicitation solicitously solidaristic solidarities solidifiable solifluction solifluxions soliloquised soliloquiser soliloquises soliloquists soliloquized soliloquizer soliloquizes solitariness solitudinous solmisations solmizations solonisation solonization solstitially solubilising solubilities solubilizing solutionists solvableness somaesthesia somaesthesis somaesthetic somatization somatologies somatologist somatomedins somatoplasms somatopleure somatostatin somatotensic somatotonias somatotropic somatotropin somatotyping sombernesses sombrenesses somersaulted somersetting somesthesias somnambulant somnambulary somnambulate somnambulism somnambulist somnifacient somniloquent somniloquies somniloquise somniloquism somniloquist somniloquize somniloquous somnipathist somniphobics somnivolency somnolencies somnolescent songstresses songwritings sonneteering sonographers sonographies sonorousness soothingness soothsayings sophisticate sophomorical sophophobics sophronizing soporiferous sorbefacient sordidnesses soreheadedly sorosilicate sorrowfulest sorrowlessly soteriologic soullessness soundeffects soundproofed soundproofer soundtracked sousaphonist southeastern southeasters southernised southernises southernisms southernized southernizes southernmost southernness southernwood southlanders southwestern southwesters