Spiro, I breathe; spiral, aspire, inspiration, conspiracy.
Spondeo (spons-um), I promise; respond, sponsor, (spouse).
Statuo, I set up; sto (stat-um), to stand; statute, statue, institute, restitution, extant, substance.
Stella, a star; stellar, constellation.
Stringo (strict-um), I bind; stringent, stricture, constrain.
Struo (struct-um), I build; structure, (construe, destroy), destruction.
Suadeo (suas-um), I persuade; persuasion, dissuade.
Sumo (sumpt-um), I take; resume, consumption.
Surgo (surrect-um), I arise; insurgent, resurrection.
Taceo, I am silent; tacit, taciturn.