3 syllables:
quantity, novelty, wallaby, colony, comradely, hostilely, broccoli, modesty, wannabe, possibly, rocketry, ology, 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, coaxingly, comity, doltishly, jokingly, slopingly, sottishly

4 syllables:
mycology, misogamy, aerology, oncology, demography, geometry, zoology, homogeny, economy, monopoly, ecology, frivolity, garbology, monopsony, ontogeny, monotony, volubly, autonomy, pomology, cacophony, synonymy, astronomy, psephology, technology, sinology, topography, horology, colostomy, conchology, 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, cajolingly, consolingly, ferociously, imposingly, provokingly, revoltingly

5 syllables:
teratology, rheumatology, anthropology, etymology, child psychology, uranology, true anomaly, laparoscopy, hematology, macrocephaly, archeology, anemometry, toxicology, aetiology, cardiography, angiology, actinometry, physiology, eschatology, 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

6 syllables:
bacteriology, solid geometry, social democracy, neuroanatomy, cardiomyopathy, antimonopoly, token economy, psychopathology, market economy, 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

7 syllables:
situation comedy, anesthesiology, psychopharmacology, physical geography, radio astronomy, projective geometry, natural theology, 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:
congenital anomaly, cultural anthropology, micropaleontology, 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