2 syllables:
ism, pisum, prism, schism

3 syllables:
ablism, agism, autism, biprism, bossism, bromism, comtism, fascism, fatism, fattism, fauvism, grecism, leftism, momism, nanism, papism, porism, racism, rightism, saktism, shaktism, sikhism, sophism, statism, sufism, tourism, tropism

4 syllables:
acosmism, actinism, activism, agonism, albinism, algorism, alpinism, altruism, aneurism, anglicism, animism, aphorism, asterism, atheism, atomism, atticism, barbarism, behmenism, benthamism, biblicism, boehmenism, bolshevism, botulism, brahmanism, brahminism, briticism, britishism, brutalism, cabalism, caesarism, caffeinism, calvinism, castroism, catechism, centralism, chauvinism, chromatism, cinchonism, classicism, communism, cretinism, criticism, cronyism, cynicism, dadaism, daltonism, dandyism, darwinism, deaf-mutism, despotism, dicrotism, docetism, dogmatism, donatism, druidism, dualism, dynamism, dysphemism, egoism, egotism, elitism, embolism, ergotism, erotism, erythrism, escapism, eunuchism, euphemism, euphuism, exorcism, extremism, familism, fatalism, federalism, feminism, fetichism, fetishism, feudalism, formalism, futurism, galenism, gallicism, galvanism, gargoylism, germanism, globalism, gnosticism, gothicism, grundyism, heathenism, hebraism, hedonism, hellenism, helotism, herbalism, heroism, hinduism, hirsutism, hitlerism, hoydenism, humanism, hybridism, hypnotism, imagism, irishism, jansenism, journalism, judaism, laconism, lamaism, lambdacism, lathyrism, latinism, legalism, leninism, liberalism, localism, locoism, logicism, lyricism, magnetism, mannerism, marcionism, mazdaism, mechanism, meliorism, mendelism, mentalism, mesmerism, methodism, mithraicism, mithraism, modernism, monachism, moralism, morphinism, muslimism, mysticism, narcissism, nativism, naturalism, naturism, nephalism, nepotism, neutralism, nicol prism, nihilism, nomadism, obiism, onanism, optimism, organism, ostracism, pacifism, paganism, panpsychism, passivism, pauperism, pessimism, phallicism, plagiarism, platonism, pluralism, pointillism, populism, pragmatism, prochronism, ptyalism, puseyism, pyrrhonism, quackerism, quakerism, quietism, racialism, rheumatism, rhotacism, rigorism, rochon prism, romanism, rowdyism, royalism, ruralism, satanism, saturnism, scepticism, schematism, scientism, sciolism, scotticism, semitism, sinapism, skepticism, socialism, solecism, southernism, specialism, spiritism, spoonerism, stalinism, stigmatism, stoicism, syllogism, symbolism, synchronism, syncretism, synergism, teratism, terrorism, tokenism, toryism, totalism, totemism, transvestism, traumatism, tribadism, trotskyism, ultraism, unionism, vaishnavism, vaisnavism, verbalism, virilism, vishnuism, vitalism, volcanism, voodooism, vulcanism, vulgarism, wahhabism, wellerism, witticism, zionism

5 syllables:
absolutism, abstractionism, acephalism, achromatism, adactylism, adoptionism, adventurism, aestheticism, africanism, agnosticism, air embolism, alcoholism, alienism, allomerism, allotropism, amensalism, amoralism, anabaptism, anachronism, anatocism, anglicanism, animalism, animatism, anomalism, anorchidism, antagonism, archaicism, arianism, asceticism, astigmatism, asynclitism, atonalism, automatism, autotelism, behaviorism, behaviourism, bilingualism, biologism, bipedalism, bureaucratism, cannibalism, capitalism, cartesianism, catabolism, catastrophism, catholicism, charlatanism, chemotropism, clericalism, collectivism, commensalism, commercialism, communalism, conceptualism, confucianism, conservatism, constructivism, consumerism, corporatism, creationism, criminalism, cryptorchidism, determinism, diabolism, diastrophism, dichromatism, didacticism, dilettantism, eclecticism, ecotourism, empiricism, endaemonism, epicurism, erastianism, erecting prism, ergotropism, eroticism, essentialism, eudaemonism, eudemonism, euhemerism, evangelism, exoticism, expansionism, expressionism, externalism, fabianism, fanaticism, favoritism, favouritism, functionalism, gallicanism, gear mechanism, geotropism, gradualism, guild socialism, hermaphrodism, historicism, hooliganism, hydrotropism, hypericism, hypocorism, illuminism, illusionism, impressionism, infantilism, initialism, insularism, invalidism, iotacism, isomerism, italianism, jacobinism, jesuitism, kantianism, katabolism, keynesianism, laconicism, libertinism, lutheranism, malapropism, male chauvinism, medievalism, mendelianism, mennonitism, mercantilism, metabolism, metachronism, metamerism, meteorism, militarism, minimalism, moderatism, monasticism, monetarism, monogenism, monorchidism, mosaicism, mutualism, nationalism, necrophilism, negativism, neologism, neuroticism, neurotropism, new criticism, noctambulism, nominalism, objectivism, obscurantism, obstructionism, officialism, opportunism, optical prism, organicism, parachronism, parallelism, paralogism, parkinsonism, pastoralism, paternalism, patriotism, perfectionism, personalism, pharisaism, philistinism, phototropism, physicalism, pleochroism, polymerism, popularism, positivism, postmodernism, prescriptivism, primitivism, proselytism, protectionism, protestantism, provincialism, puritanism, radicalism, rationalism, reactionism, recidivism, reductionism, regionalism, relativism, religionism, revisionism, ritualism, romanticism, ruffianism, scholasticism, secessionism, sectionalism, secularism, self-criticism, sensualism, separatism, serialism, somnambulism, sovietism, state socialism, subjectivism, surrealism, syndactylism, syndicalism, systematism, tautomerism, teetotalism, theanthropism, thermotropism, thigmotropism, traducianism, transvestitism, trichromatism, trophotropism, voluntarism, wesleyanism, with cynicism

6 syllables:
able-bodiedism, abolitionism, academicism, accidentalism, aeroembolism, agrarianism, aldosteronism, americanism, anti-semitism, antifeminism, arminianism, athanasianism, autoerotism, biomagnetism, bioterrorism, bohemianism, clinocephalism, colloquialism, colonialism, confessionalism, consequentialism, conventionalism, counterterrorism, deconstructionism, defence mechanism, defense mechanism, desert rheumatism, deviationism, diamagnetism, ecoterrorism, ecumenicism, emotionalism, equestrianism, escape mechanism, esotericism, evolutionism, exhibitionism, existentialism, ferrimagnetism, ferromagnetism, firing mechanism, fundamentalism, geomagnetism, hegelianism, heliotropism, higher criticism, hyperthyroidism, hypogonadism, hypothyroidism, imperialism, industrialism, infantile autism, instrumentalism, interventionism, intuitionism, isolationism, lower criticism, malthusianism, materialism, metachromatism, metasomatism, meteortropism, microorganism, mohammadanism, mohammedanism, mongolianism, monochromatism, monometallism, monophysitism, muhammadanism, narcoterrorism, neo-darwinism, neoclassicism, neoplatonism, occasionalism, occidentalism, orientalism, originalism, paramagnetism, parochialism, particularism, pelagianism, pentecostalism, petty criticism, phenomenalism, photojournalism, polydactylism, polytonalism, professionalism, reform judaism, republicanism, rosicrucianism, sabellianism, sacerdotalism, sacramentalism, sectarianism, sensationalism, sentimentalism, servomechanism, socinianism, state capitalism, steering mechanism, thromboembolism, traditionalism, transcendentalism, transsexualism, triangular prism, ultramontanism, universalism, utopianism, vernacularism, voluntaryism, yellow journalism, zoroastrianism

7 syllables:
abstract expressionism, anglo-catholicism, animal magnetism, anti-catholicism, antinomianism, antiquarianism, associationism, autoeroticism, basal metabolism, chemical mechanism, configurationism, congregationalism, constitutionalism, cosmopolitanism, eastern catholicism, ecclesiasticism, ecumenicalism, electromagnetism, environmentalism, epicureanism, evangelicalism, experimentalism, holometabolism, homoeroticism, homosexualism, hyperadrenalism, hyperinsulinism, hyperparathyroidism, hypoadrenalism, hypoparathyroidism, immaterialism, individualism, intellectualism, internationalism, judicial activism, machiavellianism, marxism-leninism, millenarianism, national socialism, neoexpressionism, neoliberalism, neoromanticism, operationalism, orthodox judaism, paleomagnetism, peripateticism, personal magnetism, photoperiodism, presbyterianism, pythagoreanism, rastafarianism, religious mysticism, roman catholicism, rotating mechanism, supernaturalism, supra expressionism, textual criticism, ultranationalism, unilateralism

8 syllables:
antiferromagnetism, aristotelianism, authoritarianism, autotrophic organism, conservative judaism, constructive metabolism, denominationalism, destructive metabolism, egalitarianism, epiphenomenalism, episcopalianism, heterosexualism, hyperaldosteronism, literary criticism, logical positivism, neocolonialism, predestinarianism, pulmonary embolism, stereoisomerism, totalitarianism, utopian socialism

9 syllables:
biochemical mechanism, hyperadrenocorticism, hypoadrenocorticism, rugged individualism, valetudinarianism

11 syllables:
dialectical materialism

4 syllables:
islamism, gigantism, quixotism, chrysophyllum

5 syllables:
literalism, ventriloquism