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.
coalshed clashed galoshed cliched clutched
coalshed toolshed woolshed welshed polished flashed relished mulched galoshed clashed flushed fleshed lashed plashed belched blushed leashed slashed slushed filched sloshed welched lushed