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.
rowboats robots rabats rabatos rebaits rebates rebatos reboots rubatos rubouts robotize rebuts rabbets rabbits rebodies rebids
boats rowboats showboats towboats bots bats bates rubouts beats sabots botas batts reboots boots rebates rabats niobates bahts baits abbots zaibatsu rebatos abatis robots jabots rubatos botts sabbats rabatos seaboots bouts debates rebaits abates