Copperheads rhymes with:
loggerheads, overheads, airheadz, arrowheads, beachheads, blockheads, bulkheads, bullheads, deadheads, egghead's, eggheads, flatheads, foreheads, loggerheads, overheads, skinheads, warheads, whitehead's
Copperheads sounds like:
cabarets, capriati's, chessboards, cooperates, cupboards, cypriots