3 syllables:
arity, charity, clarity, ferity, ferrety, garrity, geraghty, gerety, gerrity, parity, rarity, varity, verity

4 syllables:
alterity, asperity, austerity, barbarity, celerity, coverity, disparity, hilarity, imparity, incharity, legerity, molarity, planarity, polarity, posterity, procerity, prosperity, self-charity, severity, sincerity, temerity, tenerity, uncharity, vulgarity

5 syllables:
angularity, annularity, bipolarity, capillarity, cellularity, circularity, coplanarity, debonairity, exemplarity, familiarity, fissiparity, gemmiparity, germiparity, globularity, granularity, improsperity, indexterity, insincerity, insularity, jocularity, lobularity, manularity, modularity, multiparity, muscularity, nodularity, nulliparity, omniparity, oviparity, popularity, primiparity, public charity, pupillarity, regularity, scissiparity, secularity, semelparity, similarity, singularity, solidarity, specularity, stationarity, titularity, tubularity, unsincerity, vascularity, viviparity

6 syllables:
ambidexterity, avascularity, avuncularity, binocularity, complementarity, disciplinarity, irregularity, iteroparity, molecularity, multipolarity, oracularity, orbicularity, peculiarity, piacularity, rectangularity, rectilinearity, self-similarity, spectacularity, subsidiarity, triangularity, unfamiliarity, unipolarity, unpopularity, unregularity, unsimilarity, vernacularity

7 syllables:
cosine similarity, equiangularity, hypercellularity, hyperosmolarity, hypocellularity, multicellularity, overfamiliarity, ovoviviparity, transdisciplinarity, unicellularity

8 syllables:
conservation of parity, electro-capillarity, interdisciplinarity

10 syllables:
geometrical regularity

11 syllables:
geometrical irregularity

3 syllables:
errancy, warily, piracy, heronry, clerisy, perigee, orally, touristy, heresy, sneeringly, purity, cheerily, dorothy, horribly, merrily, heraldry, pharisee, wearily, tyranny, terribly, irony, forestry, therapy, jeeringly, horridly, sparingly, pleurisy, currently, parody, curacy, eerily, drearily, cherokee, barony, warranty, currency, morally, surety, airily, boringly, fierily, jeremy, laurel-tree, neuralgy, scarily, syrupy, touristry, tyranni, currishly, garishly, staringly

4 syllables:
inerrancy, minority, viverridae, maturity, inquiringly, shock therapy, seniority, sonority, transparency, coherently, authority, priority, unwarily, conspiracy, apparently, concurrently, decorously, primarily, majority, obscurity, apparency, despairingly, impurity, sorority, deplorably, gujarati, futurity, contrarily, speech therapy, aberrancy, security, coherency, cursorily, inherently, adorably, binaurally, immorally, monaurally, chincherinchee, endearingly, enquiringly, imploringly, unsparingly

5 syllables:
psychotherapy, linearity, secondarily, insecurity, voluntarily, militarily, ordinarily, empirically, categorically, incoherency, necessarily, historically, incoherently, chemotherapy, immaturity, momentarily, breach of warranty, temporarily, hydrotherapy, x-ray therapy, prematurity, chrysotherapy, paper currency, serotherapy, serum therapy, with authority, overpoweringly, unfalteringly

6 syllables:
particularity, fractional currency, superiority, dramatic irony, malacopterygii, listed security, dissimilarity, physiotherapy, radium therapy, anteriority, extraordinarily, involuntarily, social security, behavior therapy, inferiority, posteriority, socratic irony, aversion therapy, physical therapy, actinotherapy, civil authority, extemporarily, implosion therapy, letter security, public security, radiotherapy, semitransparency, supreme authority

7 syllables:
electroshock therapy, absolute majority, registered security, collective security, unlisted security, radiation therapy, agency security, government security, insulin shock therapy, perpendicularity, relative majority

8 syllables:
occupational therapy, convertible security, comptroller of the currency

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

10 syllables:
breach of the covenant of warranty