3 syllables:
changeable

4 syllables:
arrangeable, exchangeable

5 syllables:
interchangeable, unexchangeable

6 syllables:
noninterchangeable

3 syllables:
lacrimal, taxable, campanile, practical, passable, rational, madrigal, satiable, laughable, valuable, blastemal, cashable, manacle, fractional, clavicle, addable, affable, cascabel, tractable, palatal, actinal, casual, graspable, animal, anginal, nahuatl, mandible, fallible, actual, flammable, cannibal, national, acetyl, basketful, palpable, anodal, placable, addible, hasdrubal, capital, vaginal, radical, basophil, saxatile, radicle, actable, maximal, damnable, blameable, breakable, capable, datable, dateable, favorable, paintable, placeable, raisable, raiseable, salable, saleable, scalable, shakable, shakeable, traceable

4 syllables:
extractable, admirable, matabele, invaluable, detachable, propranolol, pack animal, infallible, translatable, abactinal, impalpable, hexagonal, unflappable, irrational, risk capital, compatible, inflammable, moss animal, tameable, marriageable, adaptable, grand national, unpassable, attachable, small capital, contrapuntal, collapsible, translational, diagonal, impassable, intractable, expandable, free radical, spermatocele, grammatical, octagonal, expansible, implacable, fashionable, impractical, merchantable, assailable, attainable, available, debatable, effaceable, erasable, explainable, gradational, incapable, insatiable, nonrational, obtainable, occasional, persuadable, reclaimable, replaceable, sensational, summational, sustainable, unbreakable, undatable, unnameable, unpaintable, unsalable, unsaleable, unsatiable, unscalable, unshakable, untraceable, vocational

5 syllables:
working capital, venture capital, understandable, multinational, international, semiannual, incompatible, combinational, ideational, arbitrational, ascertainable, confrontational, congregational, connotational, conversational, derivational, educational, generational, gravitational, implicational, inescapable, innovational, inspirational, invitational, irreclaimable, irreplaceable, nontranslational, observational, occupational, operational, postulational, recreational, unassailable, unattainable, unavailable, unerasable, unexplainable, unmistakable, unobtainable, unpersuadable, unreplaceable, unsensational, untranslatable, variational, vegetational

6 syllables:
national capital, domestic animal, acculturational, amphitheatrical, coeducational, denominational, nonoperational, nonrecreational, organizational, representational, unascertainable

7 syllables:
operating capital, nonrepresentational

8 syllables:
interdenominational