1.  merry-go-round(n = noun.event) - a never-ending cycle of activities and events (especially when they seem to have little purpose); "if we lose the election the whole legislative merry-go-round will have to start over"
is a kind of cycle

2.  merry-go-round(n = noun.artifact) carousel, carrousel, roundabout, whirligig - a large, rotating machine with seats for children to ride or amusement;
is a kind of ride

   Any revolving contrivance for affording amusement; esp., a group of seats in the shape of hobbyhorses or other fanciful animals, arranged in a circle on a platform that is rotated by a mechanical drive, often to the accompaniment of music; the seats often move up and down in synchrony with the rotation; -- called also carousel. It is employed primarily for the amusement of children, and is typically found at an amusement park. [1913 Webster]

merry-go-round, n.
1 a revolving machine with wooden horses or cars for riding on at a fair etc.
2 a cycle of bustling activities.

N  amusement, entertainment, recreation, fun, game, fun and games, diversion, divertissement, reaction, solace, pastime, passetemps, sport, labor of love, pleasure, relaxation, leisure, fun, frolic, merriment, jollity, joviality, jovialness, heyday, laughter, jocosity, jocoseness, drollery, buffoonery, tomfoolery, mummery, pleasantry, wit, quip, quirk, giggle, titter, snigger, snicker, crow, cheer, chuckle, shout, horse laugh, belly laugh, hearty laugh, guffaw, burst of laughter, fit of laughter, shout of laughter, roar of laughter, peal of laughter, cachinnation, Kentish fire, tiger, play, game, game at romps, gambol, romp, prank, antic, rig, lark, spree, skylarking, vagary, monkey trick, gambade, fredaine, escapade, echappee, bout, espieglerie, practical joke, dance, hop, reel, rigadoon, saraband, hornpipe, bolero, ballroom dance, minuet, waltz, polka, fox trot, tango, samba, rhumba, twist, stroll, hustle, cha-cha, fandango, cancan, bayadere, breakdown, cake-walk, cornwallis, break dancing, nautch-girl, shindig, skirtdance, stag dance, Virginia reel, square dance, galop, galopade, jig, Irish jig, fling, strathspey, allemande, gavot, gavotte, tarantella, mazurka, morisco, morris dance, quadrille, country dance, folk dance, cotillon, Sir Roger de Coverley, ballet, ball, bal, bal masque, bal costume, masquerade, Terpsichore, festivity, merrymaking, party, blowout, hullabaloo, hoedown, bat, bum, bust, clambake, donation party, fish fry, jamboree, kantikoy, nautch, randy, squantum, tear, Turnerfest, yule log, fete, festival, gala, ridotto, revels, revelry, reveling, carnival, brawl, saturnalia, high jinks, feast, banquet, regale, symposium, wassail, carouse, carousal, jollification, junket, wake, Irish wake, picnic, fete champetre, regatta, field day, treat, round of pleasures, dissipation, a short life and a merry one, racketing, holiday making, rejoicing, jubilee, bonfire, fireworks, feu-de-joie, firecracker, holiday, gala day, red letter day, play day, high days and holidays, high holiday, Bank holiday, May day, Derby day, Saint Monday, Easter Monday, Whit Monday, Bairam, wayz-goos, bean feast, Arbor Day, Declaration Day, Independence Day, Labor Day, Memorial Day, Thanksgiving Day, Mardi gras, mi-careme, feria, fiesta, place of amusement, theater, hall, concert room, ballroom, assemblyroom, music hall, park, plaisance, national park, national forest, state park, county park, city park, vest-pocket park, public park (public), arbor, garden, pleasure ground, playground, cricketground, croquet ground, archery ground, hunting ground, tennis court, racket court, bowling alley, green alley, croquet lawn, rink, glaciarum, skating rink, roundabout, merry-go-round, swing, montagne Russe, game of chance, game of skill, athletic sports, gymnastics, archery, rifle shooting, tournament, pugilism, sports, horse racing, the turf, aquatics, skating, sliding, cricket, tennis, lawn tennis, hockey, football, baseball, soccer, ice hockey, basketball, rackets, fives, trap bat and ball, battledore and shuttlecock, la grace, pall- mall, tipcat, croquet, golf, curling, pallone, polo, water polo, tent pegging, tilting at the ring, quintain, greasy pole, quoits, horseshoes, discus, rounders, lacrosse, tobogganing, water polo, knurr and spell, leapfrog, hop skip and jump, mother may I, French and English, tug of war, blindman's bluff, hunt the slopper, hide and seek, kiss in the ring, snapdragon, cross questions and crooked answers, crisscross, hopscotch, jacks, jackstones, marbles, mumblety-peg, mumble-the-peg, pushball, shinney, shinny, tag, billiards, pool, pingpong, pyramids, bagatelle, bowls, skittles, ninepins, kain, American bowls, tenpins, tivoli, cards, card games, whist, rubber, round game, loo, cribbage, besique, euchre, drole, ecarte, picquet, allfours, quadrille, omber, reverse, Pope Joan, commit, boston, boaston, blackjack, twenty- one, vingtun, quinze, thirty-one, put, speculation, connections, brag, cassino, lottery, commerce, snip-snap-snoren, lift smoke, blind hookey, Polish bank, Earl of Coventry, Napoleon, patience, pairs, banker, blind poker, draw poker, straight poker, stud poker, bluff, bridge, bridge whist, lotto, monte, three-card monte, nap, penny-ante, poker, reversis, squeezers, old maid, fright, beggar-my- neighbor, baccarat, ace, king, queen, knave, jack, ten, nine, eight, seven, six, five, four, trey, deuce, joker, trump, wild card, spades, hearts, clubs, diamonds, major suit, minor suit, bower, right bower, left bower, dummy, jackpot, deck, pair, two pair, three of a kind, straight, flush, full-house, four of a kind, royal flush, misere chess, draughts, checkers, checquers, backgammon, dominos, merelles, nine men's morris, go bang, solitaire, game of fox and goose, monopoly, loto, scrabble, scribbage, boggle, crossword puzzle, hangman, morra, gambling, toy, plaything, bauble, doll, teetotum, knickknack, magic lantern, peep show, puppet show, raree show, gallanty show, toy shop, quips and cranks and wanton wiles, nods and becks and wreathed smiles, entertainer, showman, showgirl, dancer, tap dancer, song-and-dance man, vaudeville act, singer, musician, sportsman, gamester, reveler, master of ceremonies, master of revels, pompom girl, arbiter elegantiarum, arbiter bibendi, archer, fan, toxophilite, turfman, amusing, entertaining, diverting, recreational, recreative, lusory, pleasant, laughable, witty, fun, festive, festal, jovial, jolly, jocund, roguish, rompish, playful, playful as a kitten, sportive, ludibrious, funny, very funny, hilarious, uproarious, side-splitting, amused, pleased with a rattle, tickled with a straw, laughing, risible, ready to burst, ready to split, ready to die with laughter, convulsed with laughter, rolling in the aisles, on the light fantastic toe, at play, in sport, Int, vive la bagatelle!, vogue la galere!, deus nobis haec otia fecit, dum vivimus vivamus, dulce est desipere in loco, (every room) hath blazed with lights and brayed wi, misce stullitiam consiliis brevem.

N  rotation, revolution, spinning, gyration, turning about an axis, turning aound an axis, circulation, roll, circumrotation, circumvolution, circumgyration, volutation, circination, turbination, pirouette, convolution, verticity, whir, whirl, eddy, vortex, whirlpool, gurge, countercurrent, Maelstrom, Charybdis, Ixion, cyclone, tornado, whirlwind, dust devil, spin-out, axis, axis of rotation, swivel, pivot, pivot point, axle, spindle, pin, hinge, pole, arbor, bobbin, mandrel, axle shaft, gymbal, hub, hub of rotation, helix, helical motion, angular momentum, angular velocity, revolutions per minute, RPM, centrifugal force, surge, vertigo, dizzy round, coriolus force, carousel, merry-go-round, Ferris wheel, top, dreidel, teetotum, gyroscope, turntable, lazy suzan, screw, whirligig, rollingstone, water wheel, windmill, wheel, pulley wheel, roulette wheel, potter's wheel, pinwheel, gear, roller, flywheel, jack, caster, centrifuge, ultracentrifuge, bench centrifuge, refrigerated centrifuge, gas centrifuge, microfuge, drill, augur, oil rig, wagon wheel, wheel, tire, tyre, trochilics, whirling dervish, rotating, rotary, rotary, circumrotatory, trochilic, vertiginous, gyratory, vortical, vorticose, head over heels, round and round, like a horse in a mill.