What rhymes with thwacking

2 Syllables
backingblackingclackingcrackinghackingjackinglackingpackingquackingrackingshackingslackingsmackingsnackingstackingtackingthwackingtrackingwhackingwracking
3 Syllables
attackingbacktrackingbushwhackinghijackingknapsackingunpacking
4 Syllables
barebackinglumberjackingsidetracking