3 syllables:
-ectomy, ectomy

4 syllables:
antrectomy, arthrectomy, bullectomy, bursectomy, canthectomy, carpectomy, cecectomy, cheilectomy, cirsectomy, colectomy, colpectomy, cordectomy, corectomy, corpectomy, costectomy, cystectomy, discectomy, diskectomy, frenectomy, fundectomy, gastrectomy, glomectomy, glossectomy, gyrectomy, isthmectomy, lensectomy, lipectomy, lobectomy, lumpectomy, mammectomy, mastectomy, myectomy, necrectomy, nephrectomy, neurectomy, nymphectomy, orchectomy, ostectomy, penectomy, phallectomy, phlebectomy, phrenectomy, pleurectomy, pneumectomy, proctectomy, pulpectomy, radectomy, rectectomy, sclerectomy, septectomy, splenectomy, strumectomy, syndesmectomy, tarsectomy, tenectomy, testectomy, thrombectomy, thymectomy, topectomy, tubectomy, tylectomy, typhlectomy, vasectomy, vaxectomy, vitrectomy, vulvectomy

5 syllables:
adenectomy, adipectomy, adnexectomy, apicectomy, appendectomy, atherectomy, blepharectomy, bunionectomy, callosectomy, capsulectomy, cardiectomy, cervicectomy, clitorectomy, coccygectomy, craniectomy, embolectomy, embryectomy, enterectomy, ethmoidectomy, facetectomy, fasciectomy, fistulectomy, fundusectomy, gangliectomy, gingivectomy, gonadectomy, hepatectomy, hymenectomy, hysterectomies, iridectomy, jejunectomy, keratectomy, laminectomy, laparectomy, laryngectomee, laryngectomy, lymphangiectomy, mastoidectomy, meniscectomy, mucosectomy, myomectomy, myringectomy, necrosectomy, odontectomy, omentectomy, omphalectomy, onychectomy, oophorectomy, ophthalmectomy, orchidectomy, orchiectomy, patellectomy, peritectomy, pharyngectomy, pneumonectomy, polypectomy, prostatectomy, pylorectomy, quadrantectomy, rhytidectomy, salpingectomy, segmentectomy, sequestrectomy, sigmoidectomy, stapedectomy, sympathectomy, synovectomy, tenonectomy, thyroidectomy, tonsillectomy, trachelectomy, turbinectomy, tympanectomy, urethrectomy, uvulectomy, vaginectomy, vertebrectomy

6 syllables:
adenoidectomy, adrenalectomy, alveolectomy, aneurysmectomy, apicoectomy, appendicectomy, arteriectomy, astragalectomy, cholecystectomy, clitoridectomy, duodenectomy, endarterectomy, esophagectomy, haemorrhoidectomy, hemicolectomy, hemiglossectomy, hemipelvectomy, hemispherectomy, hemorrhoidectomy, hydrocelectomy, hypophysectomy, labyrinthectomy, lymphadenectomy, nephroureterectomy, oesophagectomy, ovariectomy, pancreatectomy, panhysterectomy, panniculectomy, parotidectomy, pericardectomy, pinealectomy, proctocolectomy, radiculectomy, sympathetectomy, trabeculectomy, ureterectomy, vermilionectomy

7 syllables:
acetabulectomy, angioneurectomy, chemopallidectomy, costotransversectomy, cryothalamectomy, cystoprostatectomy, dacryocystectomy, diverticulectomy, epididymectomy, gastropylorectomy, hemicorporectomy, hemicraniectomy, hemilaminectomy, hemithyroidectomy, oophorocystectomy, parathyroidectomy, pericardiectomy, proctosigmoidectomy, suprarenalectomy, thromboembolectomy, thromboendarterectomy, varicocelectomy

8 syllables:
adenotonsillectomy, hysteromyomectomy, hysterosalpingectomy, laparohysterectomy, oophorosalpingectomy, ureteronephrectomy

9 syllables:
abdominohysterectomy, hystero-oophorectomy, ovariohysterectomy, salpingo-oophorectomy

10 syllables:
pancreatoduodenectomy

11 syllables:
pancreaticoduodenectomy

12 syllables:
hysterosalpingo-oophorectomy

2 syllables:
thessaly

3 syllables:
pregnancy, flexibly, melody, legatee, steadily, severally, splendidly, pleasantly, legacy, entity, bestially, cecity, felony, necropsy, messily, preciously, jealousy, restfully, recipe, sesame, enemy, ecstasy, tendency, seventy, entropy, ebony, especially, debauchee, pedigree, credibly, specialty, presently, gemini, destiny, venally, zealotry, mentally, density, heavily, tensity, leprosy, dreadfully, helpfully, prelacy, peasantry, lengthily, heavenly, elegy, readily, testily, specially, clemency, medically, embassy, tenantry, endlessly, weaponry, velvety, helplessly, empathy, tenancy, equity, pleasantry, zestfully, centrally, jealously, chemically, penalty, threnody, sensibly, kennedy, devilry, deputy, remedy, breathlessly, brevity, secondly, revelry, chemistry, pedantry, enmity, benghazi, dextrously, ectropy, emigree, evilly, fecklessly, jejunely, legibly, lemony, lenity, melanie, pebbly, pederasty, penally, resiny, self-pity, selflessly, senselessly, sentiency, stephanie, tepidly, trenchancy, trepidly, vengefully, yemeni, zestily

4 syllables:
inflexibly, dependency, supremacy, convexity, theosophy, incredibly, fidelity, unpleasantly, integrity, potentially, incessantly, rebelliously, transcendency, allegedly, detestably, anemone, longevity, acceptably, tremendously, repentantly, ineffably, resplendently, essentially, extremity, ascendancy, nonentity, desperately, schenectady, indemnity, expectancy, perplexity, intrepidly, ostensibly, identity, incessancy, necessity, dependably, sententiously, resplendency, lamentably, complexity, solemnity, successfully, inequity, contemptuously, amenity, discrepancy, sequentially, federally, unsteadily, separately, telepathy, intensity, insensibly, telemetry, respectfully, ascendency, preferably, licentiously, regrettably, respectably, hegemony, heredity, tentatively, generally, infectiously, perceptibly, penelope, serenity, acephaly, confessedly, defencelessly, domenici, forelady, illegibly, immensity, impendency, impetuously, inclemency, lieutenancy, perplexedly, polemically, pretentiously, professedly, quiescency, refreshfully, relentlessly, revengefully, unhelpfully

5 syllables:
disrespectfully, penitentially, irreverently, macrencephaly, unacceptably, deferentially, confederacy, geochemistry, photochemistry, biochemistry, independency, accidentally, independently, conscientiously, abstemiously, microcephaly, reverentially, fundamentally, incidentally, eventually, anencephaly, professionally, reprehensibly, unsuccessfully, intemperately, sentimentally, providentially, exceptionally, consequentially, acrocephaly, clinocephaly, coalescency, detrimentally, half-intensity, high-fidelity, hydrocephaly, intumescency, macrocephaly, megacephaly, nanocephaly, scaphocephaly, unforgettably, unpretentiously, unrepentantly

6 syllables:
radiochemistry, unconventionally, experimentally, interdependency, coincidentally, cercopithecidae, biogeography, impetuosity, unintentionally, inconsequentially, immunochemistry, environmentally, electrochemistry, unsentimentally

7 syllables:
paleogeography