3 syllables:
-acity, acity, cassetty, cassity, cass city, gas city, pasay city, udacity

4 syllables:
ampacity, audacity, bibacity, capacity, dicacity, edacity, feracity, furacity, loquacity, mendacity, metacity, minacity, mordacity, opacity, predacity, procacity, rapacity, sagacity, tenacity, urbacity, veracity, vivacity, voracity

5 syllables:
disputacity, efficacity, incapacity, inveracity, perspicacity, pertinacity, pervicacity, saponacity, unveracity

6 syllables:
biocapacity, carnivoracity, channel capacity, mental capacity, overcapacity, radiopacity, seating capacity

7 syllables:
radio-opacity

8 syllables:
electrical capacity

10 syllables:
list of stadiums by capacity

3 syllables:
happily, fractiously, gallantly, thankfully, tapestry, axletree, phantasy, cabinetry, capably, scammony, apogee, chastity, nastily, blasphemy, anthony, sanity, craftily, cavity, rapidly, banditry, tragedy, balcony, rampantly, gascony, balmily, gravelly, captaincy, galaxy, travesty, fallacy, gravity, patchouli, nascency, stagnancy, damnably, laxity, bashfully, halfpenny, apathy, satiny, faculty, calumny, valiantly, valency, ataxy, abbacy, absently, antony, lazily, baptistery, atrophy, amnesty, majesty, callously, mangabey, maggoty, scantily, practically, anxiously, anomie, angrily, flashily, cadency, gallantry, agony, rhapsody, falconry, sassaby, agilely, scrappily, tangency, bankruptcy, passably, saxony, patently, tammany, malady, gadgetry, fantasy, valiancy, family, pageantry, handily, tastily, basketry, cannily, manfully, tactfully, alchemy, plangency, randomly, canopy, affably, manatee, cavalry, vanity, rackety, strategy, rascally, actively, amity, candidly, cassidy, casuistry, clannishly, drastically, faddishly, gaspingly, gramineae, graphically, haptically, lavishly, magically, mattingly, naseby, panicky, pantingly, passively, radically, raffishly, ramblingly, raspingly, sanctity, savagely, slantingly, smashingly, stragglingly, tragically, validly

4 syllables:
tonality, modality, casually, formality, vitality, unhappily, brutality, concavity, depravity, rationally, casualty, actually, diastole, alacrity, compatibly, mentality, catastrophe, mortality, anatomy, locality, nasality, substantially, naturally, mammalogy, calamity, neutrality, frugality, legality, insanity, philately, totality, analogy, elaborately, disassembly, academy, type family, profanity, nationally, lethality, juglandaceae, reality, anastrophe, normality, sodality, finality, carnality, philanthropy, morality, pulp cavity, examinee, financially, adactyly, attractively, banality, , bombastically, centrality, combatively, dramatically, ecstatically, emphatically, enchantingly, erratically, expansively, fantastically, fatality, grammatically, humanity, mechanically, nostalgically, offhandedly, organically, outstandingly, plurality, protractedly, romantically, sarcastically, sporadically, syndactyly, theatrically, venality

5 syllables:
sexuality, cordiality, triviality, understandably, actuality, factuality, unreality, criticality, abnormality, royal family, circumstantially, joviality, alismatidae, subnormality, geniality, satisfactorily, gross anatomy, liberality, nationality, practicality, commonality, hylobatidae, nasal cavity, inhumanity, irrationally, hospitality, underhandedly, animality, sensuality, spiral galaxy, oral cavity, generality, musicality, unnaturally, partiality, atonality, autocratically, automatically, brachytactyly, christianity, criminality, cruciality, democratically, diplomatically, enigmatically, everlastingly, geographically, graduality, illegality, immorality, immortality, informality, inorganically, marginality, mutuality, personality, principality, punctuality, puritanically, rationality, single-handedly, sociality, speciality, symptomatically, systematically, technicality, unattractively, undramatically, ungrammatically, unromantically

6 syllables:
asexuality, center of gravity, total depravity, araliaceae, infant mortality, tympanic cavity, incorporeality, pathetic fallacy, congeniality, specific gravity, unilaterally, bilaterality, universality, irrationality, spirituality, substantiality, amaranthaceae, nuclear family, centre of gravity, ambystomatidae, bisexuality, municipality, thoracic cavity, extended family, milky way galaxy, internationally, dimensionality, artificiality, conceptuality, conditionality, conventionality, diagrammatically, directionality, effectuality, emotionality, enthusiastically, eventuality, impartiality, instrumentality, intentionality, materiality, originality, orthogonality, proportionality, sentimentality, split personality, traditionality, undemocratically, undiplomatically, unsystematically

7 syllables:
segmentation cavity, superficiality, homosexuality, insubstantiality, immateriality, amniotic cavity, abdominal cavity, territoriality, confidentiality, virtual reality, anal personality, constitutionality, counterfactuality, cult of personality, individuality, ineffectuality, internationality, oral personality, unconventionality, unemotionality, unenthusiastically, unoriginality

8 syllables:
microscopic anatomy, military academy, genital personality, heterosexuality, multiple personality, sexual immorality

9 syllables:
psychopathic personality