Luncheons rhymes with:
abstentions, intentions, interventions, mansions, tensions, abstentions, appalachians, bastions, christians, fortune's, fortunes, hitchens, houtchens, hutchens, intentions, interventions, kitchen's, kitchens, mansions, misfortunes, question's, questions, questions', sebastian's, suggestions, tensions, urchins
Luncheons sounds like:
lancing, langhans, languishing, lankans, lansing, lansing's, launching, launchings, lawmaking, leingang, lensing, limousines, linking, longing, longings, lounging, luminescence, lunching, lunging, lynching, lynchings