3 syllables:
-arian, aerien, aerion, arien, arion, berrian, berrien, burion, carian, carrian, carrion, cherian, clarion, darian, darien, darion, derian, ferien, hereon, kerien, kerion, khmerian, marian, marion, marry in, mary in, merion, merrion, parian, quarian, tarian, terrien, varian, vary in

4 syllables:
abderian, agrarian, ahmarian, allerion, aquarian, armarian, asterion, aterian, aularian, badarian, barbarian, bavarian, bessarion, bilzerian, breatharian, bulgarian, bulgarien, calgarian, canarian, cancerian, cercarian, cimmerian, contrarian, cybrarian, diarian, dimyarian, filarian, flammarion, fossarian, ganbarion, gregarian, herbarian, hesperian, hikarian, hilarion, hipparion, homerian, hungarian, icarian, kasparian, kazarian, kripparrian, lactarian, librarian, lunarian, magarian, maidmarian, malarian, markarian, megarian, mezereon, najarian, nazarean, nazarian, numerian, omarion, ontarian, orarian, orarion, orpharion, ovarian, pedarian, planarian, quinarian, rigarion, riparian, rotarian, scyllarian, sectarian, septarian, shaksperian, sicarian, siderian, skenderian, solarian, statarian, sticharion, tartarian, tatarian, telarian, tocharian, tractarian, triarian, trimyarian, verbarian, vicarian, vissarion, voltairian, voltarean, voltarian, vulgarian, wagnerian, wernerian, yossarian, zakarian, zeuzerian

5 syllables:
acroterion, actuarian, antiquarian, apiarian, araucarian, bagdasarian, bestiarian, catenarian, centenarian, contractarian, culinarian, dan bilzerian, delawarian, dietarian, doctrinarian, eskandarian, fastilarian, flexitarian, floscularian, fruitarian, fustilarian, holomyarian, hypoarian, hypoarion, janizarian, jubilarian, laminarian, lapidarian, lauretarian, libertarian, limitarian, lucernarian, megantereon, mercenarian, millenarian, multitarian, necessarian, non-sectarian, nonsectarian, nothingarian, old bulgarian, paramerion, pescatarian, pescetarian, piscetarian, planetarian, plumularian, postlapsarian, pre-nectarian, prelapsarian, procellarian, proletarian, pulmonarian, ripuarian, sabbatarian, sagittarian, sanitarian, semi-arian, seminarian, sertularian, solitarian, stercorarian, sublapsarian, sublibrarian, subtartarean, synaxarion, topiarian, trinitarian, trochanterian, tubularian, turbellarian, ubiquarian, unitarian, unsectarian, vegaquarian, vegetarian, vegitarian, vestiarian, virgularian, zoantharian

6 syllables:
abecedarian, actiniarian, adessenarian, alcyonarian, alphabetarian, ana kasparian, antiquitarian, anythingarian, apollinarian, atrabilarian, austro-bavarian, austro-hungarian, authoritarian, campanularian, catilinarian, celibatarian, cnidarian, communitarian, corpuscularian, disciplinarian, documentarian, egalitarian, episcoparian, equalitarian, franco-ontarian, futilitarian, humanitarian, infralapsarian, madreporarian, majoritarian, materiarian, miscellanarian, necessitarian, non-vegetarian, nonagenarian, octogenarian, parliamentarian, postmillenarian, predestinarian, premillenarian, quadragenarian, quinquagenarian, quodlibetarian, radiolarian, reticularian, right-libertarian, sacramentarian, semibarbarian, sexagenarian, societarian, stipendiarian, suburbicarian, supralapsarian, totalitarian, triunitarian, ubiquitarian, utilitarian, veterinarian, vocabularian

7 syllables:
altitudinarian, antisabbatarian, antitrinitarian, attitudinarian, civil-libertarian, demi-vegetarian, establishmentarian, experimentarian, inegalitarian, lacto-vegetarian, lactovegetarian, latitudinarian, ovo-vegetarian, pescovegetarian, platitudinarian, plenitudinarian, semi-vegetarian, septuagenarian, solitudinarian, supercentenarian, trisacramentarian, ultracrepidarian, uniformitarian, utero-ovarian, valetudinarian

8 syllables:
antiauthoritarian, disestablishmentarian

9 syllables:
antiestablishmentarian, lacto-ovo-vegetarian, ovo-lacto-vegetarian, ovolactovegetarian

10 syllables:
antidisestablishmentarian

3 syllables:
syrian, morion, durian, virion, dorian, aryan, durion, chorion, saurian, zyrian

4 syllables:
centurion, delawarean, historian, algerian, grammarian, caesarian, stentorian, criterion, silurian, illyrian, praetorian, siberian, cesarian, assyrian, missourian, shakespearian, hyperion, victorian, eutherian, pretorian, tellurian, valerian, sumerian, shakespearean, nigerian, aurorean, cesarean, fomorian, kerkorian, liberian

5 syllables:
infusorian, metatherian, rastafarian, red valerian, epicurean, hanoverian, presbyterian, singaporean, archosaurian, art historian, ecuadorian, greek valerian, holothurian, indo-aryan, megatherian, prototherian, salvadorean, salvadorian

6 syllables:
salutatorian, valedictorian, common valerian, titanosaurian