3 syllables:
missioner

4 syllables:
auditioner, auditionner, conditioner, editioner, parishioner, partitioner, petitioner, positioner, practitioner, traditioner

5 syllables:
admonitioner, air-conditioner, airconditioner, coalitioner, exhibitioner, malpractitioner, nurse-practitioner, preconditioner, repetitioner, requisitioner

2 syllables:
sprinkler

3 syllables:
pistoleer, singular, limiter, listener, spinnaker, disjuncture, chinaware, ligature, wriggler, titular, lincolnshire, kitchenware, dishonour, vinegar, signaller, tricolour, cinnabar, minister, visitor, lithosphere, figeater, chiffonier, millibar, stiffener, swindler, sycamore, bicolor, similar, insofar, christopher, slipcover, triphammer, insular, fiddler, stickler, fistular, tricolor, picador, integer, simpler, thickener, diffuser, chiseller, signaler, sinoper, signature, minotaur, chiseler, cislunar, insecure, inciter, tickler, prisoner, pinafore, singapore, scimitar, cylinder, windjammer, littler, quizmaster, cricketer, driveller, filature, ignitor, kibitzer, riveter, victualer, victualler, wiggler

4 syllables:
articular, navicular, solicitor, unipolar, decimeter, inhibitor, altimeter, lenticular, liquidambar, estimator, exhibitor, distributer, commissionaire, contributor, inquisitor, binuclear, calligrapher, dissimilar, particular, perimeter, acicular, reticular, ossicular, cuticular, distributor, funicular, vermicular, orbicular, administer, apishamore, calicular, capitular, collimator, dosimeter, judicature, provisioner

5 syllables:
countersignature, curvilinear, polarimeter, perpendicular, calorimeter, argentinosaur, colorimeter, colourimeter

6 syllables:
extracurricular

7 syllables:
atrioventricular