Servio, I serve; servant, service, servitor.
Servo, I preserve; reserve, conservative, conservatory.
Signum, a mark; sign, signify, designation.
Simĭlis, like; dissimilar, similitude, resemble, dissemble.
Sisto, I stop; insist, consistency.
Solus, alone; solitary, sole.
Solvo (solūt-um), I loose; absolute, resolve, solution, resolution.
Somnus, sleep; somnolent, somnambulist.
Specio (spect-um) I see; aspect, retrospect, specious.
Spero, I hope; despair, desperate.