Walk-on rhymes with:
alarcon, catchacan, comecon, digicon, econ, emoticon, ethicon, farrakhan, helicon, lexicon, logicon, midcon, nikon, oerlikon, planecon, polysilicon, semicon, technicon, yukon
Walk-on sounds like:
waleson, walken, walkin', walkman, wallison, welcome, wellcome, wholesome, wilcoxen, wilcoxon, wilcoxson, wilken, wilkin, wilkison, willison, willson, wilshusen, wilson, wolken, woloszyn, woolson