Highboy rhymes with:
attaboy, brayboy, busboy, carboy, cowboy, doughboy, farmboy, lamboy, littleboy, playboy, schoolboy, tomboy
Highboy sounds like:
heckuva, hecuba, hiccup, hicfa, higbee, higbie, higby, hookup, housewife, huckaba, huckabay, huckabee, huckaby, huckeba, husby, huseby, hyssop