2 syllables:
achar, acker, aker, akkar, akker, akre, backer, back her, bakar, bakker, blacker, bracher, bracker, braquer, clacker, claquer, cracker, craquer, dacker, dakkar, drakkar, flacker, hacker, jacker, knacker, kracker, lacher, lacker, lacquer, laquer, macher, makar, nachor, nacker, packer, phacker, phracker, quacker, racker, sacar, sacchar, sacchar-, sachar, sacher, sacker, schacher, slacker, smacker, snacker, spacker, stacker, tacker, thacher, thacker, thakkar, tracker, trackir, vacher, wacker, whacker, yacker, yakare, yakker, zacher

3 syllables:
arnaquer, attacker, attaquer, backpacker, bullwhacker, bushwhacker, carjacker, cat cracker, corn-cracker, greenbacker, highjacker, hijacker, kobacker, linebacker, line backer, mantracker, meatpacker, nutcracker, outbacker, protracker, racetracker, ransacker, safe-cracker, safecracker, schabacker, shellcracker, skyjacker, souljacker, unpacker, vanacker, weed-whacker, weizsaecker, wit-cracker, woodcracker, ytcracker

4 syllables:
biohacker, cannon cracker, clark's nutcracker, firecracker, graham cracker, hydrocracker, illywhacker, milkytracker, neha kakkar, opentracker, oyster cracker, pokertracker, rickenbacker, soda cracker, the nutcracker

5 syllables:
common nutcracker

6 syllables:
catalytic cracker

3 syllables:
wildcatter, icelander, flycatcher, right-hander, bystander, highlander

4 syllables:
true flycatcher

5 syllables:
tyrant flycatcher, new world flycatcher, old world flycatcher, spotted flycatcher

6 syllables:
vermillion flycatcher