Couponite rhymes with:
bouknight, kernite, arganbright, argenbright, barite, bauxite, bouknight, buchheit, burright, cortright, crosswhite, ferrite, gaslight, gesundheit, halite, hebenstreit, hessite, hittite, hypolite, kernite, landviewite, leifheit, ludite, nephrite, perlite, previte, pyrite, raphaelite, searight, semite, stutheit, termite, tracheophyte, transvestite, weisheit
Couponite sounds like:
cabinda, cabinet, caffeinate, caffeinated, casavant, cheapened, checkpoint, copayment, covenant, covent