Diction rhymes with:
addiction, benediction, contradiction, interdiction, jurisdiction, prediction, addiction, affliction, benediction, constriction, contradiction, conviction, crucifixion, depiction, dereliction, eviction, fiction, friction, infliction, interdiction, jurisdiction, nonfiction, prediction, restriction
Diction sounds like:
d'agostino, dagestan, dagostino, dakotan, daughton, dedication, deduction, degaetano, deighton, desiccation, destin, destiny, destitution, detection, detoxication, dichotomy, dickstein, dictation, dictum, dideoxycytidine, digaetano, digestion, digidyne, disdain, dissection, dissociation, doughten, dukedom, dustin, dustman, duston