=Rex= (=reg=-is), a king; regal, interregnum, royal. =Rideo= (=rīs=-um), I laugh; deride, derision. =Rivus=, a brook; river, rival. =Rodo= (=ros=-um), I gnaw; erosion, corrode. =Rogo=, I ask; derogatory, interrogation, arrogate. =Rota=, a wheel; rote, rotation, rotund, round. =Rumpo= (=rupt=-um), I break; rupture, disruption, irruption, eruption. =Rus= (=rūr=-is), the country; rural, rustic. =Sacer=, sacred; desecrate, sacrilege. =Sal=, salt; saline, salary [= salt-money]. =Salio= (=salt=-um), I leap; sally, assail, assault, insult, salmon [= the _leaping_ fish], salient. =Salus= (=salūt=-is), health; =salvus=, safe; salutary, salubrious, salvation. =Sanctus=, holy; sanctify, saint =Sanguis= (=sanguin=-is), blood; sanguinary. =Sano= (=sanāt=-um), I cure; sanitary, sane, insane. =Sapio=, I taste or am wise; sapient, insipid, savour. =Scando= (=scans=-um), I climb; =scala=, a ladder; scan, scale, ascension, descend. =Scio=, I know; science, scientific, conscience, omniscient. =Scribo= (=script=-um), I write; scribe, scripture, manuscript, describe. =Seco= (=sect=-um), I cut; dissect, insect, segment, section. =Sedeo= (=sess=-um), I set; sediment, subside, residence. =Senex=, an old man; senile, senior, senate, senator. =Sentio= (=sens=-us), I feel or perceive; sense, sentimental. =Septem=, seven; septennial, September. =Sequor= (=secūt=-us), I follow; sequel, consecutive, consequent. =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. =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. =Tango= (=tact=-um), I touch; intangible, contact, contagious. =Tego= (=tect=-um), I cover; integument, detect. =Tempus= (=tempŏr=-is), time; temporal, tense.