acknowledgment, action and reaction, answer, answering, antiphon, automatic reaction, autonomic reaction, back answer, back talk, backchat, boom, booming, bounceback, comeback, echo, evasive reply, growl, growling, grumble, grumbling, predictable response, reaction, ready reply, reboation, rebound, receipt, reecho, reflection, reflex, reflex action, refluence, reflux, rejoinder, repartee, replication, reply, repost, rescript, rescription, resound, resounding, respondence, response, responsion, responsory, retort, retroaction, return, revulsion, riposte, rise, rumble, rumbling, short answer, snappy comeback, thunder, thundering, unthinking response, witty reply, witty retort, yes-and-no answer
repetition, iteration, reiteration, harping, recurrence, succession, run, battology, tautology, monotony, tautophony, rhythm, diffuseness, pleonasm, redundancy, chimes, repetend, echo, ritornello, burden of a song, refrain, rehearsal, rechauffe, rifacimento, recapitulation, cuckoo, reverberation
, drumming, renewal, twice-told tale, old story, old song, second edition, new edition, reappearance, reproduction, recursion, periodicity, repeated, repetitional, repetitionary, recurrent, recurring, ever recurring, thick coming, frequent, incessant, redundant, pleonastic, monotonous, harping, iterative, recursive, unvaried, mocking, chiming, retold, aforesaid, aforenamed, above-mentioned, above-said, habitual, another, repeatedly, often, again, anew, over again, afresh, once more, ding-dong, ditto, encore, de novo, bis, da capo, again and again, over and over, over and over again, recursively, many times over, time and again, time after time, year after year, day by day, many times, several times, a number of times, many a time, full many a time, frequently, ecce iterum Crispinus, toujours perdrix, cut and come again, tomorrow and tomorrow and tomorrow, cantilenam eandem canis, nullum est jam dictum quod non dictum sit prius.
recoil, reaction, retroaction, revulsion, bounce, rebound, ricochet, repercussion, recalcitration, kick, contrecoup, springing back, elasticity, reflection, reflexion, reflex, reflux, reverberation
, rebuff, repulse, return, ducks and drakes, boomerang, spring, reactionist, elastic collision, coefficient of restitution, recoiling, refluent, repercussive, recalcitrant, reactionary, retroactive, on the rebound, on the recoil, for every action there is a reaction, equal in force and opposite in direction.
roll, drumming, berloque, bombination, rumbling, tattoo, drumroll, dingdong, tantara, rataplan, whirr, ratatat, ratatat-tat, rubadub, pitapat, quaver, clutter, charivari, racket, cuckoo, repetition, peal of bells, devil's tattoo, reverberation
, clickety-clack, hum, purr, hummingbird, cat, kitten (animal sounds), rolling, monotonous, like a bee in a bottle.
resonance, ring, ringing, tintinabulation, reflexion, reflection, reverberation
, echo, reecho, zap, zot, buzz (hiss), low note, base note, bass note, flat note, grave note, deep note, bass, basso, basso profondo, baritone, barytone, contralto, echo chamber, resonator, tinnitus, bell, doorbell, buzzer, gong, cymbals (musical instruments), sympathetic vibrations, natural frequency, coupled vibration frequency, overtone, resonating cavity, sounding board, tuning fork, tuning, squelch, frequency selection, resonator, resonator circuit, radio resonant structure, aromaticity, alternating double bonds, non-bonded resonance, pi clouds, unsaturation, double bond, (valence), resounding, resonant, reverberant, tinnient, tintinnabulary, sonorous, booming, deep-toned, deep-sounding, deep-mouthed, vibrant, hollow, sepulchral, gruff, sweet bells jangled, out of time and harsh, echoing down the mountain and through the dell.