3 syllables:
acertar

2 syllables:
carper, barber, lurker, parker, burger, snorter, garter, harbor, berber, ardor, birder, murder, hoarder, barker, scarper, mortar, yarder, sirdar, charter, herder, order, forbear, shirker, carter, ardour, larder, girder, forebear, warder, arbor, burgher, worker, harper, corker, starter, verger, tartar, darter, sorter, torpor, martyr, border, arguer, yorker, porker, shorter, porter, marker, quarter, turgor, harbour, durbar, markhor, arbour, parterre, barter, boarder, markhoor, harder, sharper, barbour, berger, borger, darker, ordure, puerto, sartor, serger, smarter

3 syllables:
absorber, recorder, nonstarter, rank order, last quarter, trench mortar, disorder, pearl harbor, supporter, co-worker, in order, exporter, first quarter, stop order, court order, safe harbor, ann arbor, reporter, transporter, snail darter, word order, enlarger, mail order, importer, reorder, box girder, new yorker, bank charter, blue darter, cardsharper, close order, converter, day boarder, departer, dock worker, farm worker, grape arbor, grape arbour, great charter, hall porter, hard worker, inverter, kicksorter, kick starter, large order, line worker, mailsorter, mass murder, night porter, plant order, race murder, self-starter, skilled worker, suborder, subverter, tall order, trained worker, usurper, wool sorter

4 syllables:
postal order, speech disorder, market order, superorder, supercharger, out of order, bricks and mortar, money order, pecking order, cream of tartar, standing order, point of order, open order, batting order, shock absorber, tape recorder, purchase order, sleep disorder, social worker, billiard marker, blood disorder, civil order, credit order, draw and quarter, fellow worker, forequarter, fungus order, garment worker, in good order, james earl carter, jimmy carter, latin quarter, magic marker, nosey-parker, nosy-parker, polymarker, power worker, pullman porter, research worker, rules of order, silverworker, torque converter, unpaid worker, welfare worker

5 syllables:
wire recorder, panic disorder, mental disorder, manic disorder, animal order, bladder disorder, cassette recorder, data converter, every quarter, extended order, factory worker, in working order, miracle worker, natural order, nervous disorder, phobic disorder, religious order, telephone order, temporal order, treble recorder, tv reporter

6 syllables:
athletic supporter, conversion disorder, depressive disorder, affective disorder, sleep terror disorder, bipolar disorder, acute brain disorder, bacteria order, bessemer converter, genetic disorder, glandular disorder, magnetic recorder, rotary converter, temporary worker, violent disorder

7 syllables:
anxiety disorder, delusional disorder, distinguished service order, catalytic converter, congenital disorder, electrical converter, electronic converter, emotional disorder, inherited disorder, medical social worker, schizophrenic disorder, television reporter

8 syllables:
psychosomatic disorder, posttraumatic stress disorder, videocassette recorder, personality disorder, major affective disorder, neurological disorder, respiratory disorder

9 syllables:
attention deficit disorder, gastrointestinal disorder, immunological disorder

11 syllables:
generalized anxiety disorder