Decathlon rhymes with:
delaune, sephlon, absecon, acetosyringone, alteon, bergeron, calgon, crampon, delaune, devaughn, doggone, einon, haton, incheon, inchon, jumbotron, kirwan, lieson, malathion, mouton, papon, ptyon, recon, rubicon, savion, savon, scaleatron, sephlon, styron, suon, teason