1 syllable:
'round, -bound, bound, browned, clowned, crowned, csound, downed, drowned, found, frowned, gowned, ground, hound, lb, mound, pound, round, sj-sound, stound, swound, towned, wound

2 syllables:
abound, aground, air-bound, all-round, allround, around, astound, background, barkbound, bearhound, bed-ground, bedground, bloodbound, boarhound, boozehound, brass-bound, brassbound, browbound, buckhound, campground, casebound, chairbound, chowhound, cloth-bound, clothbound, cofound, compound, confound, consound, coonhound, crop-bound, dachshound, dashound, deerhound, desk-bound, deskbound, disbound, discrowned, downbound, draghound, dumfound, earth-bound, earthbound, eastbound, egg-bound, elkhound, embrowned, enround, enwound, expound, facound, fairground, fogbound, foot-pound, foreground, foxhound, freesound, frost-bound, gepound, go-round, gold-bound, grayhound, greyhound, gunbound, half-bound, half-round, hardbound, harehound, hellbound, hellhound, hidebound, hoarhound, home-bound, homebound, hoofbound, horehound, housebound, howlround, icebound, imbound, impound, inbound, inch-pound, infound, limehound, lobspound, lymhound, mahound, misground, missound, moon-round, new-found, newfound, newground, newshound, newsround, nursehound, outbound, outground, outsound, pine-crowned, playground, pot-bound, potbound, prebound, profound, propound, qsound, re-sound, rebound, redound, refound, renowned, resound, rewound, rock-bound, rockbound, rockhound, rootbound, rug-gowned, runround, seabound, showground, shunt-wound, sighthound, siteground, skinbound, sleuth-hound, sleuthhound, slothhound, slowhound, sluthhound, smooth-hound, smoothhound, snow-bound, snowbound, softbound, soundhound, southbound, spell-bound, spellbound, staghound, starbound, stone-ground, stoneground, stormbound, strikebound, surround, turnround, unbound, uncrowned, unfound, ungowned, unground, unowned, unround, unsound, unwound, upbound, well-bound, well-found, westbound, whip-round, windbound, wolfhound, wood-bound, wrapround, year-round, yground

3 syllables:
above-ground, aboveground, aftersound, air-to-ground, all-around, axewound, battleground, bellybound, belowground, casapound, cpu-bound, decompound, directsound, duty-bound, eurohound, fantasound, figure-ground, freshlyground, gazehound, getaround, go-around, homeward-bound, honor-bound, honour-bound, infrasound, interwound, ironbound, irrenowned, leather-bound, lost-and-found, middle-ground, misexpound, muscle-bound, musclebound, office-found, otterhound, outward-bound, overground, overwound, paperbound, playaround, pleasure-ground, quarter-bound, run-around, runaround, scalebound, semiround, sensurround, series-wound, shootaround, sound-on-sound, spiral-bound, steeple-crowned, surrebound, triple-crowned, turnaround, ultrasound, unconfound, underground, water-bound, weather-bound, weatherbound, winter-ground, work-around, workaround, world-renowned, wrap-around, wraparound, year-around

4 syllables:
electrosound, georgenotfound, gill-over-the-ground, merry-go-round, merrygoround, overabound, superabound

5 syllables:
supradecompound

6 syllables:
decemberunderground, theater-in-the-round, theaters-in-the-round, theatre-in-the-round