rigor, ōris, m., severity, rigor.
rīpa, ae, f., a bank (of a river).
rīsus, ūs [rīdeō], m., laughter.
rītē [cf. rītus], adv., with due ceremonies, duly, fitly, properly.
rītus, ūs, m., religious ceremony, rite.
rixa, ae, f., a quarrel (of blows), brawl.
rōbur, oris, n., hard wood, oak; strength, vigor, power.
[rogō, āre, āvī, ātus], to ask, inquire; request, implore.
ab—abrogō, āre, āvī, ātus, to repeal, annul.
inter—interrogō, āre, āvī, ātus, to ask, question.