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.
polished plashed pleached polychete polychaete
polished relished welshed slushed lashed leashed lushed blushed flashed fleshed flushed clashed cliched coalshed galoshed plashed slashed sloshed toolshed woolshed