2 syllables:
buying, crying, dieing, drying, dyeing, flying, frying, gieing, guying, hieing, high hung, hyang, hying, lying, niang, pieing, plying, prying, scrying, shying, sighing, skying, snying, spying, stying, tieing, trying, tying, vying, wrying

3 syllables:
air-drying, allying, applying, bedyeing, belying, blow-drying, blowdrying, bulk-buying, complying, decrying, deep-frying, defying, denying, descrying, downlying, drip-drying, fast-flying, freeze-drying, high-flying, highflying, implying, inlying, kiln-drying, kite-flying, kiteflying, low-lying, n.flying, nondrying, outflying, outlying, pan-frying, quick-drying, relying, replying, retrying, shanghaiing, stunt flying, supplying, test-flying, tie-dyeing, undying

4 syllables:
alibiing, amplifying, argufying, beautifying, brutifying, butterflying, calcifying, calefying, certifying, chondrifying, citifying, clarifying, classifying, codifying, crucifying, damnifying, dandifying, deifying, densifying, dignifying, dulcifying, edifying, falsifying, fortifying, frenchifying, fructifying, gasifying, gentrifying, glorifying, goh liu ying, gratifying, horrifying, ignifying, jellifying, justifying, lignifying, liquefying, liquifying, lullabying, madefying, magnifying, metrifying, minifying, misapplying, modifying, mollifying, mortifying, multiplying, mummifying, mystifying, nazifying, nitrifying, noncomplying, notifying, nullifying, occupying, ossifying, overbuying, overflying, overlying, pacifying, petrifying, preachifying, prettifying, purifying, putrefying, qualifying, quantifying, ramifying, rarifying, ratifying, reapplying, rectifying, reifying, resupplying, russifying, salifying, sanctifying, satisfying, scarifying, scorifying, self-applying, self-denying, semidrying, signifying, simplifying, specifying, speechifying, stratifying, stultifying, stupefying, tabefying, terrifying, testifying, torpifying, torrefying, tumble-drying, tumefying, typifying, uglifying, uncomplying, underlying, unifying, verifying, versifying, vilifying, vitrifying, vivifying, yuppifying

5 syllables:
acetifying, acidifying, alkalifying, beatifying, catalog buying, commodifying, decalcifying, decertifying, declassifying, demystifying, denazifying, denitrifying, detoxifying, devitrifying, disqualifying, dissatisfying, diversifying, electrifying, emulsifying, esterifying, exemplifying, humidifying, identifying, indemnifying, installment buying, instrument flying, intensifying, lapidifying, misclassifying, objectifying, opacifying, oversupplying, personifying, preoccupying, pretypifying, reclassifying, reoccupying, reunifying, revivifying, rigidifying, saccharifying, saponifying, self-justifying, self-satisfying, silicifying, solidifying, syllabifying, transmogrifying, undersupplying, unedifying, ungratifying, unsatisfying

6 syllables:
dehumidifying, misidentifying, oversimplifying