3 syllables:
racional, stational

4 syllables:
citational, creational, durational, formational, foundational, gradational, gyrational, irracional, lactational, librational, locational, migrational, mutational, mutation null, narrational, negational, nonrational, notational, nutational, oblational, ovational, probational, quotational, relational, rotational, salvational, sensational, summational, translational, vibrational, vocational

5 syllables:
aberrational, adaptational, aggradational, aggregational, agitational, annexational, applicational, arbitrational, aspirational, avocational, calculational, collocational, combinational, compensational, computational, condensational, conformational, confrontational, congregational, conjugational, connotational, conservational, conspirational, conversational, convocational, correlational, deformational, demonstrational, denudational, derivational, deviational, dilatational, dispensational, dissertational, educational, elevational, emanational, emigrational, expectational, explorational, generational, gravitational, habitational, hyperrational, ideational, illustrational, imitational, immigrational, implicational, incantational, inclinational, incubational, informational, inhalational, innervational, innovational, inspirational, intonational, invitational, invocational, irrigational, irrotational, levitational, maturational, mediational, meditational, motivational, navigational, nontranslational, obligational, observational, occupational, operational, oscillational, permutational, perorational, perturbational, populational, posttranslational, postulational, predicational, presentational, prevocational, progestational, propagational, radiational, recreational, reformational, reputational, respirational, revelational, salutational, segregational, situational, speciational, terminational, transformational, transpirational, unsensational, valuational, variational, vegetational, venerational, visitational, volitational

6 syllables:
accommodational, acculturational, associational, civilizational, co-educational, coeducational, communicational, configurational, consociational, denominational, discriminational, documentational, examinational, hallucinational, imaginational, improvisational, interpretational, interrogational, investigational, nonconfrontational, noneducational, nonoccupational, nonoperational, nonrecreational, organisational, organizational, orientational, preoperational, pronunciational, representational

7 syllables:
intergenerational, multigenerational, non-denominational, nondenominational, nonrepresentational, psychoeducational, reorganizational, undenominational

8 syllables:
interdenominational

3 syllables:
lacrimal, taxable, campanile, practical, passable, madrigal, satiable, laughable, valuable, blastemal, cashable, manacle, fractional, clavicle, addable, affable, cascabel, tractable, palatal, actinal, tangible, casual, graspable, animal, anginal, nahuatl, mandible, fallible, actual, flammable, cannibal, acetyl, basketful, palpable, anodal, placable, addible, hasdrubal, capital, vaginal, radical, basophil, saxatile, radicle, actable, maximal, damnable, blameable, breakable, capable, changeable, 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, unchangeable, abactinal, impalpable, hexagonal, infrangible, unflappable, risk capital, compatible, inflammable, moss animal, tameable, marriageable, adaptable, unpassable, attachable, small capital, contrapuntal, collapsible, diagonal, impassable, intractable, expandable, free radical, spermatocele, grammatical, intangible, octagonal, expansible, implacable, fashionable, impractical, merchantable, assailable, attainable, available, debatable, effaceable, erasable, exchangeable, explainable, incapable, insatiable, obtainable, occasional, persuadable, reclaimable, replaceable, sustainable, unbreakable, undatable, unnameable, unpaintable, unsalable, unsaleable, unsatiable, unscalable, unshakable, untraceable

5 syllables:
working capital, venture capital, understandable, semiannual, incompatible, ascertainable, inescapable, interchangeable, irreclaimable, irreplaceable, unassailable, unattainable, unavailable, unerasable, unexchangeable, unexplainable, unmistakable, unobtainable, unpersuadable, unreplaceable, untranslatable

6 syllables:
national capital, domestic animal, amphitheatrical, unascertainable

7 syllables:
operating capital