Execution rhymes with:
persecution, prosecution, electrocution, elocution, persecution, prosecution, electrocution, elocution, persecution, prosecution
Execution sounds like:
eastham, eastin, eastman, easton, echidna, eckstein, ecosystem, ecton, eighteen, ejection, equation, equitation, estan, esteem, estonia, estonian, exaction, excitation, executone, exhaustion, exton, eyestone