Millionaire rhymes with:
multimillionaire, billionaire, multimillionaire, billionaire, multimillionaire, billionaire, multimillionaire, billionaire, concessionaire, debonair, doctrinaire, multimillionaire, nationair, questionnaire
Millionaire sounds like:
malnar, melnor, milliner, millner, milner, molenaar, molinar, molinari, molinaro, mollenhauer, mollner, molnar, molner, muellner