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, balmily, blossomy, bottletree, caudally, connally, cosily, cozily, dottily, foxily, knobbly, noxiously, obloquy, promisee, prophesy, rommany, rottenly, squalidly, stodgily, talkily, watchfully

4 syllables:
monopsony, ontogeny, monotony, volubly, autonomy, pomology, cacophony, synonymy, astronomy, psephology, verbosity, technology, sinology, horology, colostomy, conchology, mycology, misogamy, aerology, oncology, geometry, zoology, homogeny, economy, monopoly, ecology, frivolity, garbology, doxology, tocology, neurology, philology, democracy, apostrophe, cytology, ontology, impolitely, anthology, comradery, thermometry, geology, geodesy, phonology, phytology, hypocrisy, nosology, demonstrably, ethnology, penology, gastronomy, atrocity, loquacity, velocity, misology, ichthyology, agrology, improbably, viscosity, impossibly, apostasy, moronity, comparably, proctology, equality, commodity, despondently, inconstancy, porosity, spectroscopy, gibbosity, prodigally, impotency, pathology, philosophy, bureaucracy, dishonesty, theology, neology, virology, conjugally, apology, monstrosity, jocosity, unconsciously, ethology, serology, psychology, mahogany, insolvency, allopathy, hydrometry, theocracy, phylogeny, tautology, optometry, morphology, agronomy, otology, astrometry, callosity, urology, histology, ferocity, hydrology, mythology, despondency, chronology, posology, anomaly, biology, responsibly, allometry, dichotomy, fluoroscopy, phrenology, astrology, enology, idolatry, spectrometry, homology, monogamy, seismology, autocracy, precocity, petrology, limnology, algometry, allotropy, androgeny, apogamy, arthroscopy, astrolatry, autogeny, bardolatry, biogeny, cosmolatry, exogamy, globosity, gymnosophy, immodestly, immodesty, isogamy, isometry, lithotomy, lordolatry, mammalogy, monocracy, naprapathy, obnoxiously, plutocracy, psychometry, pyrolatry, self-consciously, symbolatry, tetralogy, theosophy, top-quality, topolatry, verbolatry, viscometry, zoolatry

5 syllables:
sinuosity, laparoscopy, hematology, macrocephaly, archeology, anemometry, toxicology, aetiology, angiology, actinometry, physiology, eschatology, teratology, rheumatology, anthropology, etymology, uranology, dermatology, hagiology, volcanology, mineralogy, audiometry, haematology, ophthalmology, radiology, axiology, primatology, inequality, scientology, embryology, adiposity, herpetology, gynaecology, parisology, stereoscopy, tortuosity, etiology, jejunostomy, aristocracy, ideology, tuberosity, egyptology, trigonometry, oenology, mediocrity, teleology, methodology, paleology, speleology, generosity, terminology, audiology, genealogy, cardiology, archaeology, sociology, poenology, animosity, entomology, immunology, criminology, curiosity, ornithology, climatology, adenopathy, irresponsibly, tracheostomy, lexicology, meniscectomy, sociometry, pharmacology, gerontology, numerosity, anthropometry, grandiosity, densitometry, anisogamy, gynecology, episiotomy, anthropolatry, arborolatry, bibliolatry, celioscopy, demonolatry, diabolatry, disconsolately, glutinosity, gynaeolatry, gyneolatry, hagiolatry, heliolatry, iconolatry, idiolatry, laparotomy, palaeology, passamaquody, preciosity, radioscopy, spelaeology, sumerology, symbololatry, thaumatolatry, tragicomedy, unselfconsciously

6 syllables:
neuroanatomy, cardiomyopathy, antimonopoly, psychopathology, bacteriology, endocrinology, paleobotany, religiosity, geomorphology, neuropsychology, meteorology, biotechnology, parapsychology, glottochronology, palaeontology, epistemology, neurobiology, paleontology, numismatology, microbiology, agrobiology, assyriology, cholelithotomy, hypervelocity, palaeobotany, palaetiology, paletiology, protozoology, seriocomedy, voluminosity

7 syllables:
anesthesiology, psychopharmacology, paleopathology, epidemiology, bioclimatology, paleobiology, psychophysiology, paleornithology, neurophysiology, immunopathology, palaeobiology, palaeodendrology, palaeogeology, palaeopathology, palaeornithology, palaeozoology, paleodendrology, paleogeology, paleomammalogy, paleozoology, protoanthropology, protoarchaeology, protoarcheology, sociobiology

8 syllables:
micropaleontology, paleoclimatology, paleoanthropology, palaeoclimatology