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, galactotherapy, galvanotherapy, heliotherapy, hirudotherapy, homeotherapy, immunotherapy, implosion therapy, iodotherapy, iontotherapy, kinesitherapy, 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

2 syllables:
katie, weighty, lady, plaguy, flaky, layby, eighty, streaky, achy, platy, shaky, shady, maybe, haiti, slaty, baby, matey, brady, flakey

3 syllables:
pink lady, blue baby, young lady, old lady, first lady, bush baby, crybaby, war baby, bag lady, kuwaiti, milady, 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:
leading lady, tupaiidae, aberrancy, adorably, apparency, apparently, authority, barbarity, binaurally, celerity, coherency, coherently, concurrently, conspiracy, contrarily, deplorably, dexterity, disparity, hilarity, immorally, impurity, inerrancy, inherently, legerity, majority, maturity, minority, molarity, monaurally, obscurity, polarity, posterity, primarily, priority, prosperity, security, sincerity, sonority, sorority, temerity, transparency, unwarily

5 syllables:
premature baby, 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:
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:
absolute majority, agency security, collective security, government security, hypercellularity, hypocellularity, manual dexterity, perpendicularity, registered security, relative majority, unlisted security

8 syllables:
comptroller of the currency, conservation of parity, convertible security

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

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

11 syllables:
geometrical irregularity