3 syllables:
therapie, therapy, therapy?

4 syllables:
shock therapy, speech therapy

5 syllables:
ammotherapy, apitherapy, aurotherapy, autotherapy, biotherapy, brachytherapy, chemotherapie, chemotherapy, chromotherapy, chronotherapy, chrysotherapy, crounotherapy, crymotherapy, cryotherapy, cupping therapy, curietherapy, ergotherapy, halotherapy, hemotherapy, hydrotherapy, hypnotherapy, logotherapy, massotherapy, mesotherapy, monotherapy, narcotherapy, nestitherapy, opotherapy, osmotherapy, pelotherapy, phototherapy, phytotherapy, pneumotherapy, polytherapy, prolotherapy, psychotherapie, psychotherapy, pyrotherapy, sclerotherapy, seismotherapy, serotherapy, serum-therapy, serum therapy, teletherapy, theotherapy, thermotherapy, tomotherapy, x-ray therapy, zomotherapy

6 syllables:
actinotherapy, aversion therapy, balneotherapy, behavior therapy, bibliotherapy, climatotherapy, conversion therapy, dermatotherapy, electrotherapy, galactotherapy, galvanotherapy, heliotherapy, hirudotherapy, homeotherapy, immunotherapy, implosion therapy, iodotherapy, iontotherapy, magnetotherapy, mechanotherapy, metallotherapy, musicotherapy, odontotherapy, organotherapy, pharmacotherapy, physical therapy, physiotherapy, pneumatotherapy, pyretotherapy, radiotherapy, radium therapy, roentgenotherapy, somatotherapy, thalassotherapy, vegetotherapy

7 syllables:
alimentotherapy, auriculotherapy, autohemotherapy, bacteriotherapy, chemoradiotherapy, cyclocryotherapy, electroshock therapy, insulin shock therapy, photochemotherapy, radiation therapy

8 syllables:
occupational therapy

9 syllables:
radioimmunotherapy

11 syllables:
dialectical behavior therapy

3 syllables:
skillfully, visibly, timpani, symphony, synchrony, visually, tiffany, tinselly, whiffletree, infamy, flippancy, stringency, sympathy, viciously, wicopy, timothy, willowy, stickily, dimity, dittany, signally, wiggly, ministry, fixity, fidgety, instantly, vividly, filigree, brilliancy, litany, spitefully, symmetry, trilogy, brilliantly, stingily, finicky, trinity, brittany, imagery, instancy, villainy, bigotry, dismally, industry, fiscally, wilfully, flippantly, bigamy, dingily, mistily, rickety, dignity, willfully, tripoli, whippletree, differently, finitely, timidly, minutely, sicily, swingletree, infancy, piquancy, italy, syncope, chivalry, infantry, giddily, dizzily, airily, barony, cheerily, cherokee, clarity, clerisy, curacy, currency, currently, dorothy, drearily, eerily, errancy, fierily, forestry, heraldry, heresy, heronry, horribly, horridly, irony, jeremy, laurel-tree, merrily, morally, neuralgy, orally, parity, parody, piracy, pleurisy, purity, rarity, scarily, surety, syrupy, terribly, touristry, touristy, tyranni, tyranny, verity, warily, warranty, wearily

4 syllables:
polygyny, proclivity, sufficiently, futility, viscidity, magistracy, benignancy, proficiency, facsimile, hostility, captivity, vicinity, gravimetry, torridity, indignity, salinity, antiquity, malignancy, publicity, invisibly, contingency, auspiciously, virility, utility, implicitly, solidity, resiliency, rigidity, liquidity, acidity, obstinately, rapidity, perniciously, tumidity, vapidity, aridity, astringency, toxicity, fluidity, humidity, timidity, turbidity, fragility, civility, antistrophe, ambitiously, affinity, antipathy, deficiency, spasticity, officially, cyclicity, initially, fertility, complicity, delinquency, sapidity, sweet cicely, asynchrony, polyphony, senility, deliciously, infinity, torpidity, epiphany, soliloquy, docility, ability, simplicity, religiously, flaccidity, abysmally, pasigraphy, miserably, polygamy, tepidity, proximity, avidity, growth industry, limpidity, felicity, antigone, sufficiency, explicitly, turgidity, festivity, placidity, literally, activity, immorally, consistently, liberally, tonicity, validity, mobility, prolixity, amphictyony, sphericity, culicidae, agility, somniloquy, viridity, nobility, ductility, asymmetry, consistency, propitiously, morbidity, efficiency, debility, divinity, nativity, epitome, efficiently, calligraphy, exigency, irritably, aberrancy, adorably, apparency, apparently, authority, barbarity, binaurally, celerity, coherency, coherently, concurrently, conspiracy, contrarily, deplorably, dexterity, disparity, hilarity, impurity, inerrancy, inherently, legerity, majority, maturity, minority, molarity, monaurally, obscurity, polarity, posterity, primarily, priority, prosperity, security, sincerity, sonority, sorority, temerity, transparency, unwarily

5 syllables:
intermittency, self-sufficiency, cucurbitaceae, alkalimetry, expeditiously, inauspiciously, exiguity, insufficiency, contractility, eccentricity, insufficiently, conditionally, relativity, creativity, unofficially, alkalinity, surreptitiously, masculinity, meretriciously, inefficiency, atonicity, originally, pellucidity, probability, supersymmetry, elasticity, domesticity, artificially, conductivity, injudiciously, volatility, holy trinity, deliberately, magnanimity, ellipticity, legibility, negativity, versatility, invalidity, infelicity, peripherally, catholicity, additionally, electricity, insipidity, intrepidity, femininity, inutility, calorimetry, feasibility, aborigine, inconsistency, chromaticity, unanimity, promiscuously, viability, fortuitously, traditionally, service industry, flexibility, possibility, productivity, irresistibly, inefficiently, unchristianly, specificity, avariciously, reactivity, colorimetry, capability, selectivity, angularity, breach of warranty, cellularity, circularity, familiarity, granularity, incoherency, incoherently, insincerity, jocularity, lobularity, militarily, momentarily, necessarily, ordinarily, paper currency, popularity, regularity, secondarily, similarity, singularity, solidarity, temporarily, voluntarily, with authority

6 syllables:
compatibility, radial symmetry, idiosyncrasy, invisibility, superciliously, susceptibility, reliability, individually, amiability, unequivocally, periodicity, muscular dystrophy, availability, chemical industry, malleability, apocynaceae, perfectibility, joint probability, acceptability, mental deficiency, neuropsychiatry, responsibility, public utility, applicability, pusillanimity, irritability, adaptability, palatability, unconditionally, admissibility, insensitivity, ignominiously, ambidexterity, civil authority, complementarity, dissimilarity, dramatic irony, extemporarily, extraordinarily, fractional currency, involuntarily, irregularity, letter security, listed security, particularity, peculiarity, public security, rectangularity, semitransparency, social security, socratic irony, supreme authority, triangularity, unfamiliarity, unregularity, unsimilarity

7 syllables:
superconductivity, juvenile delinquency, inaccessibility, sexual activity, relative humidity, bioelectricity, bilateral symmetry, anthropocentricity, comprehensibility, hydroelectricity, irresponsibility, radioactivity, lactobacillaceae, static electricity, automobile industry, photoconductivity, special relativity, thermoelectricity, absolute majority, agency security, collective security, government security, hypercellularity, hypocellularity, manual dexterity, perpendicularity, registered security, relative majority, unlisted security

8 syllables:
theory of relativity, general relativity, piezoelectricity, comptroller of the currency, conservation of parity, convertible security

9 syllables:
atmospheric electricity, over the counter security, redevelopment authority, regulatory authority

10 syllables:
breach of the covenant of warranty, geometrical regularity

11 syllables:
geometrical irregularity