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.