2 syllables:
data of, date of, dative, eight of, fate of, gait of, gate of, great of, late of, mate of, nativ, native, plate of, rate of, sative, slate of, spate of, state of, strait of, trait of, weight of

3 syllables:
cessative, creative, cunctative, debate of, equative, estate of, frustrative, gestative, illative, innative, ipsative, locative, mutative, non-native, nonnative, placative, probative, pulsative, quiddative, rotative, substrative, translative, unnative, update of, vitative, writative

4 syllables:
abdicative, abnegative, abrogative, aggravative, agitative, allocative, altercative, animative, annotative, appellative, approbative, arbitrative, auscultative, automative, calculative, capitative, caritative, catenative, circulative, cogitative, colliquative, comitative, commentative, commutative, compellative, compensative, compulsative, concentrative, condensative, confrontative, conjugate of, conjugative, connotative, consecrative, consummative, conversative, copulative, degradative, denigrative, denudative, deprecative, designative, detonative, devastative, deverbative, deviative, dissipative, dubitative, educative, emanative, emulative, entitative, exclamative, exhortative, expiative, extirpative, exudative, fabricative, facultative, frequentative, glutinative, gravitative, hesitative, imbricative, imitative, impetrative, incarnative, inchoative, incrassative, incubative, infiltrative, innovative, instigative, insulative, integrative, irrigative, irritative, isolative, iterative, lacerative, legislative, limitative, lubricative, mediative, meditative, meliorative, memorative, ministrative, miscreative, mitigative, modulative, motivative, mutilative, nauseative, obligative, obviative, oppilative, oscillative, oxidative, penetrative, perforative, permeative, personative, perturbative, procreative, propagative, punctuative, qualitative, quantitative, quidditative, radiative, re-creative, recreative, regulative, renovative, replicative, reprobative, retardative, segregative, similative, simulative, singulative, stimulative, stipulative, suffocative, titillative, tolerative, transmutative, ulcerative, uncreative, undulative, urinative, usitative, vegetative, ventilative

5 syllables:
abirritative, accelerative, accommodative, accumulative, adjudicative, administrativ, administrative, affiliative, affinitative, agglutinative, alleviative, alliterative, amalgamative, ameliorative, annihilative, anticipative, appreciative, appropriative, asphyxiative, assimilative, associative, authoritative, capacitative, coagulative, collaborative, commemorative, commiserative, conglutinative, consolidative, continuative, cooperative, debilitative, deliberative, delimitative, delineative, denunciative, deoppilative, depreciative, disintegrative, dissimulative, dissociative, elucidative, emancipative, emasculative, enumerative, enunciative, eradicative, evacuative, evaluative, evaporative, exaggerative, excogitative, exfoliative, exhilarative, exonerative, extenuative, extrapolative, exulcerative, facilitative, habilitative, incogitative, inirritative, inoculative, interpolative, interpretative, interrogative, intoxicative, investigative, invigorative, irradiative, manifestative, manipulative, necessitative, non-perturbative, nonimitative, obliterative, opinionative, precipitative, premeditative, procrastinative, prognosticative, proliferative, pronunciative, reciprocative, recommendative, refrigerative, reintegrative, reiterative, rememorative, renunciative, repudiative, resuscitative, reverberative, self-regulative, substantiative

6 syllables:
antioxidative, deteriorative, disassimilative, disassociative, inappreciative, inauthoritative, interpenetrative, neurovegetative, nonassociative, nonprognosticative, quasi-legislative, recapitulative, rehabilitative, semiquantitative, unappreciative

7 syllables:
anticoagulative, antiproliferative, isoagglutinative, lymphoproliferative, surface-assimilative

8 syllables:
myeloproliferative

3 syllables:
formative, hortative, purgative, purposive, normative

4 syllables:
conservative, preservative, interpretive, affirmative, alternative, superlative, reformative, informative, confirmative, adversative

5 syllables:
uninformative

6 syllables:
ultraconservative