Luncheon rhymes with:
abstention, circumvention, contravention, fanchon, inattention, intention, intervention, muenchen, nonintervention, ponchan
Luncheon sounds like:
lamagna, lamison, lamkin, lamson, lanagan, lancome, lancon, langan, langen, langham, langman, langone, langsam, lanigan, laningham, lankan, lencioni, leninism, lenzen, lenzini, lewinsohn, limousine, lincecum, lincicome, linguine, linson, loewenson, lomasney, lonesome, longan, longino, longman