rubber, n. caoutchouc, India-rubber; overshoe, galoshe, galoche; eraser.  Associated Words:  vulcanize, vulcanization.

rubbing, n. friction, abrasion, attrition, chafing, fraying; embrocation; massage.

rubbing out. erasure, obliteration, effacement.

rubbish, n. trash, litter, lumber, refuse, debris, garbage, dross, trumpery.

rubicund, a. ruddy, florid.

rub out. erase, obliterate, expunge, efface.

rub up. burnish, scour, polish.

ruck, n. wrinkle, crease; (Colloq.) common sort.

rudder, n.  Associated Word:  tiller.

ruddy, a. red, florid, rubicund, blowzed.

rude, a. crude, unpolished, raw, rough, indelicate, unrefined, coarse, undisciplined, uncivilized; inelegant, inartistic, artless; uncivil, discourteous, inurbane, impolite, romping, hoidenish; boisterous, turbulent, violent, inclement, tumultuous; unwrought, unfashioned.

rudiment, n. element; embryo; pl. elements, accidence.

rudimentary, n. rudimental, elementary, initial; embryonic, embryo.

rue, v. regret, deplore.

rueful, a. woeful, sad, lugubrious, mournful.

ruffian, n. monster, villain, rowdy, desperado.

ruffle, n. ruff, frill, flounce, furbelow; perturbation, flurry, bustle.

ruffle, v. pucker, pleat, wrinkle; rumple, derange, disarrange, disorder; agitate, discompose, perturb, disconcert; swagger, strut.

rugged, a. irregular, rough, uneven, scraggy, cragged, craggy; inclement, tempestuous, turbulent, boisterous, wild; (Colloq.) robust, hardy, vigorous; austere, crabbed, harsh, unfeeling.

ruin, n. bane, pest, plague.

ruin, n. wreck, destruction, undoing, dilapidation, disorganization, perdition, ruination, subversion, shipwreck, downfall, havoc, demolition.

ruin, v. overthrow, subvert, destroy, wreck, ruinate, impoverish.

ruination, n. ruin.

ruinous, a. destructive.

rule, n. regulation, prescript, prescription, order, ruling; standard, criterion, touchstone, brocard; maxim, law, canon; norm; government, sway, regency, domination, authority, direction, empire, dynasty, supremacy, administration, regime.

rule, v. govern, dominate; restrain, influence, sway, prevail, dominate, preponderate, domineer.

ruler, n. governor, sovereign, monarch, president, king, potentate, dynast, lord, satrap, rajah, emir, caliph, burgrave, procurator, Pharaoh, interregent, despot, regent, dominator, arbiter, viceroy, vicegerent, autocrat, oligarch, liege lord, protector, kaiser, czar, dey, doge, mogul, pasha, bey, tetrarch, khedive, sultan, emperor.

ruling, a. regnant, reigning; predominant, dominative, dominant, prevailing.

ruling, n. government, regnancy.

rum, a. (Slang) queer, odd, old-fashioned.

ruminate, v. meditate, muse, ponder, reflect.

rumination, n. meditation.