I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
robots rowboats reboots rubouts robotize rabats rebuts rabbets rabbits rebaits rebates rebodies rebids rabatos rebatos rubatos
abbots bots sabots jabots robots boats ebbets cubits qubits rabats bods rabbits rabbets obits rebuts sabbats habits seaboots debits debuts towboats bets buts bats gobbets biotas reboots bits botts rubouts botas bouts gibbets rowboats abuts boots abets hobbits zibets debts doubts showboats
robot rebody reboot rebought robbed robed rowboat rubout probate probed probit probity