Debonair rhymes with:
billionaire, concessionaire, doctrinaire, millionaire, multimillionaire, nationair, questionnaire, billionaire, concessionaire, doctrinaire, ensnare, finnair, glenayre, knerr, macnair, mcnair, millionaire, multimillionaire, nair, nationair, ne'er, questionnaire, snare
Debonair sounds like:
depner, dobmeier, duffner, dufner