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, travelocity, tuberosity, tumulosity, unctuosity, vaporosity, viciosity, virtuosity, vitiosity

6 syllables:
anfractuosity, caliginosity, defectuosity, escape velocity, fastidiosity, fuliginosity, hemizygosity, homozygosity, hypervelocity, hyperviscosity, impetuosity, 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

3 syllables:
wallaby, colony, comradely, hostilely, broccoli, modesty, wannabe, possibly, rocketry, ology, quantity, novelty, policy, bodily, sodomy, botany, psalmody, homily, prodigy, sovereignty, monstrously, boloney, honesty, twopenny, audibly, frostily, honestly, constantly, quality, ptolemy, hostelry, bonhomie, comedy, dobsonfly, solidly, dovekie, commonly, potbelly, potently, romany, polony, constancy, monody, progeny, wantonly, modestly, consciously, gossipy, colloquy, crotchety, prosody, monandry, cobwebby, odyssey, prophecy, contrasty, probably, wobbly, wannabee, polity, oddity, conakry, caustically, chronically, comically, dohickey, dominie, frolicky, hominy, jollity, logically, mockingly, modishly, mombin tree, palmistry, snobbishly, suavity, topically, toppingly

4 syllables:
monopsony, ontogeny, monotony, volubly, autonomy, pomology, cacophony, synonymy, astronomy, psephology, technology, sinology, topography, horology, colostomy, conchology, mycology, misogamy, aerology, oncology, demography, geometry, zoology, homogeny, economy, monopoly, ecology, frivolity, garbology, doxology, tocology, neurology, philology, democracy, apostrophe, cytology, lithography, ontology, impolitely, anthology, pornography, comradery, thermometry, geology, geodesy, phonology, phytology, hypocrisy, nosology, demonstrably, orthography, ethnology, penology, gastronomy, misology, typography, ichthyology, agrology, trade policy, improbably, impossibly, apostasy, moronity, comparably, proctology, equality, commodity, despondently, inconstancy, spectroscopy, prodigally, impotency, pathology, philosophy, bureaucracy, planography, dishonesty, photography, theology, neology, virology, conjugally, apology, cartography, unconsciously, ethology, serology, psychology, mammography, ethnography, mahogany, insolvency, allopathy, hydrometry, theocracy, phylogeny, tautology, optometry, morphology, agronomy, otology, astrometry, urology, histology, hydrology, geography, mythology, despondency, chronology, posology, anomaly, biology, responsibly, allometry, biography, dichotomy, phrenology, fluoroscopy, low comedy, holography, astrology, enology, idolatry, spectrometry, homology, monogamy, seismology, autocracy, petrology, limnology, causality, exhaustively, illogically, ironically, laconically, lye hominy, methodically, pearl hominy, rhapsodically, sardonically, symbolically

5 syllables:
laparoscopy, hematology, macrocephaly, archeology, anemometry, toxicology, aetiology, cardiography, angiology, actinometry, physiology, eschatology, teratology, rheumatology, anthropology, etymology, child psychology, uranology, true anomaly, dermatology, hagiology, volcanology, mineralogy, bibliography, depth psychology, audiometry, lexicography, haematology, ophthalmology, radiology, axiology, fiscal policy, primatology, inequality, scientology, embryology, herpetology, gynaecology, parisology, roentgenography, stereoscopy, etiology, high technology, jejunostomy, crystallography, aristocracy, foreign policy, ideology, egyptology, trigonometry, oenology, mediocrity, teleology, choreography, radiography, methodology, paleology, speleology, ideography, terminology, audiology, genealogy, cardiology, archaeology, sociology, poenology, entomology, immunology, criminology, ornithology, climatology, adenopathy, irresponsibly, oceanography, anemography, hagiography, tracheostomy, lexicology, meniscectomy, sociometry, pharmacology, plane geometry, gerontology, anthropometry, densitometry, anisogamy, gynecology, chromatography, anorthography, angiography, episiotomy, economically, electronically, patriotically, periodically, philosophically, psychologically, technologically, vitriolically

6 syllables:
neuroanatomy, cardiomyopathy, antimonopoly, token economy, psychopathology, market economy, bacteriology, solid geometry, social democracy, autobiography, social psychology, musical comedy, endocrinology, human ecology, chromolithography, paleobotany, ultrasonography, geomorphology, folk etymology, neuropsychology, meteorology, biotechnology, cinematography, parapsychology, glottochronology, offset lithography, palaeontology, epistemology, arteriography, neurobiology, insurance policy, paleontology, numismatology, applied psychology, telephotography, microbiology, moral philosophy, ideologically, unpatriotically

7 syllables:
projective geometry, natural theology, situation comedy, anesthesiology, psychopharmacology, physical geography, radio astronomy, clinical psychology, paper chromatography, spherical geometry, african mahogany, paleopathology, epidemiology, bioclimatology, philippine mahogany, cognitive psychology, paleobiology, social anthropology, psychophysiology, dialect geography, electromyography, column chromatography, paleornithology, natural philosophy, neurophysiology, doctor of philosophy, immunopathology

8 syllables:
cultural anthropology, micropaleontology, congenital anomaly, physical anthropology, comparative psychology, economic geography, paleoclimatology, molecular biology, proprietary colony, hyperbolic geometry, industrial psychology, paleoanthropology, analytic geometry, political economy

9 syllables:
developmental psychology, experimental psychology

10 syllables:
physiological psychology