2 syllables:
appar, apper, capper, chapar, clapper, crapper, dapper, flapper, frapper, gapper, happer, hapur, japer, japper, kapper, kapur, klapper, knapper, lapar, laper, lapper, mapper, napper, papper, rapper, sapper, schnapper, scrapper, shapur, slapper, strapper, tapper, trapper, whapper, wrapper, yapper, zapper

3 syllables:
attraper, backslapper, bishapur, catnapper, didapper, dimapur, divedapper, dognapper, empapar, kidnaper, kidnapper, knee-slapper, kolhapur, portmapper, ranakpur, recapper, thigh-slapper, uncapper, wit-snapper

4 syllables:
citymapper, handicapper, understrapper, whippersnapper, wiretapper

2 syllables:
bladder, cracker, hacker, spatter, clabber, jabber, mater, whacker, smatter, smacker, grabber, chatter, tracker, stabber, backer, catarrh, tatter, tabour, splatter, stagger, hatter, bagger, attar, knacker, ladder, madder, natter, platter, satyr, scatter, packer, blabber, shatter, nagger, jaeger, latter, tatar, flatter, clatter, matter, jagger, swagger, patter, slacker, dagger, slabber, batter, lacquer, ratter, adder, bader, bakker, faqir, pabir

3 syllables:
attacker, bespatter, backscatter, vannatter

4 syllables:
cloak-and-dagger, pitter-patter, turko-tatar