3 syllables:
-osity, cross city, docity, kaw city, osity, paucity, raucity

4 syllables:
aquosity, atrocity, bogosity, callosity, carnosity, crinosity, dinocity, eurocity, famosity, ferocity, fibrosity, fumosity, gemmosity, glebosity, globosity, gulosity, gummosity, lumosity, monstrosity, morbosity, morosity, mucosity, muscosity, neurocity, nodosity, pilosity, piosity, plumosity, pomposity, porosity, precocity, rimosity, rugosity, schistosity, serosity, spicosity, torosity, umbrosity, varicosity, velocity, ventosity, verbosity, villosity, viscosity, vivocity

5 syllables:
actuosity, amorosity, animosity, cariosity, curiosity, dubiosity, ebriosity, epulosity, flatuosity, flexuosity, foliosity, four-velocity, generosity, glandulosity, glutinosity, grandiosity, hideosity, high-velocity, imporosity, lachrymosity, monstruosity, mulierosity, nebulosity, numerosity, oleosity, operosity, otiosity, pendulosity, pluviosity, populosity, preciosity, radiosity, reciprocity, sabulosity, salebrosity, saporosity, scrupulosity, sensuosity, sinuosity, speciosity, sumptuosity, tediosity, tenebrosity, tortuosity, travelocity, tuberosity, tumulosity, unctuosity, vaporosity, viciosity, virtuosity, vitiosity

6 syllables:
anfractuosity, caliginosity, defectuosity, escape velocity, fastidiosity, fuliginosity, hemizygosity, homozygosity, hypervelocity, hyperviscosity, incuriosity, inunctuosity, libidinosity, litigiosity, muzzle velocity, negotiosity, religiosity, ridiculosity, sententiosity, spirituosity, voluminosity

7 syllables:
absolute viscosity, dynamic viscosity, equinumerosity, heterozygosity, impecuniosity, overscrupulosity, terminal velocity, unit of viscosity

9 syllables:
coefficient of viscosity

2 syllables:
thessaly

3 syllables:
severally, splendidly, pleasantly, messily, tendency, ebony, pedigree, credibly, gemini, venally, leprosy, prelacy, lengthily, elegy, readily, tenantry, weaponry, helplessly, equity, zestfully, remedy, breathlessly, brevity, revelry, flexibly, melody, steadily, entity, jealousy, restfully, enemy, seventy, entropy, tensity, peasantry, clemency, velvety, threnody, sensibly, devilry, chemistry, pedantry, pregnancy, legacy, bestially, cecity, necropsy, sesame, zealotry, mentally, density, dreadfully, helpfully, testily, specially, embassy, tenancy, pleasantry, centrally, kennedy, deputy, secondly, enmity, legatee, felony, preciously, recipe, ecstasy, especially, debauchee, specialty, presently, destiny, heavily, heavenly, medically, endlessly, empathy, jealously, chemically, penalty, caustically, chronically, comically, dohickey, dominie, frolicky, hominy, jollity, logically, mockingly, modishly, mombin tree, palmistry, snobbishly, suavity, topically, toppingly

4 syllables:
theosophy, incessantly, rebelliously, transcendency, detestably, acceptably, resplendently, extremity, ascendancy, nonentity, mastectomy, expectancy, identity, necessity, dependably, lamentably, successfully, inequity, discrepancy, sequentially, unsteadily, lobectomy, ascendency, preferably, serenity, fidelity, unpleasantly, nephrectomy, potentially, death penalty, tremendously, essentially, flux density, desperately, schenectady, lumpectomy, intrepidly, ostensibly, sententiously, complexity, splenectomy, insensibly, telemetry, respectfully, respectably, hegemony, generally, inflexibly, dependency, supremacy, anemone, longevity, repentantly, ineffably, perplexity, vasectomy, resplendency, solemnity, contemptuously, amenity, federally, intensity, heredity, perceptibly, convexity, incredibly, integrity, allegedly, indemnity, incessancy, separately, telepathy, licentiously, low density, regrettably, thrombectomy, tentatively, infectiously, penelope, causality, exhaustively, illogically, ironically, laconically, lye hominy, methodically, pearl hominy, rhapsodically, sardonically, symbolically

5 syllables:
tonsillectomy, orchidectomy, geochemistry, mask of pregnancy, hysterectomy, eventually, sympathectomy, life expectancy, sentimentally, exceptionally, consequentially, confederacy, biochemistry, accidentally, mastoidectomy, independently, tubal pregnancy, reverentially, oophorectomy, white supremacy, professionally, stapedectomy, orchiectomy, pneumonectomy, salpingectomy, thyroidectomy, disrespectfully, appendectomy, penitentially, irreverently, macrencephaly, abstemiously, rhytidectomy, incidentally, intemperately, open sesame, providentially, high fidelity, prostatectomy, unacceptably, deferentially, photochemistry, independency, conscientiously, embolectomy, microcephaly, fundamentally, vapor density, anencephaly, reprehensibly, unsuccessfully, economically, electronically, patriotically, periodically, philosophically, psychologically, technologically, vitriolically

6 syllables:
cholecystectomy, unconventionally, coincidentally, biogeography, unintentionally, environmentally, radiochemistry, physical chemistry, simple mastectomy, manifest destiny, interdependency, electrochemistry, organic chemistry, cercopithecidae, experimentally, cosmetic dentistry, inconsequentially, adrenalectomy, immunochemistry, relative density, ideologically, unpatriotically

7 syllables:
ovarian pregnancy, radical mastectomy, inorganic chemistry, magnetic flux density, paleogeography, abdominal pregnancy, total hysterectomy

8 syllables:
radical hysterectomy

10 syllables:
modified radical mastectomy