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.
cloudier cloddier clouter clowder colluder colder cloture clutter coulter gladier caldera cluttery collider coleader colter glider golder gloater guilder clatter glitter gladder culture collator killdeer clattery guiltier gleetier caldaria glittery gauleiter kelter kilter kultur
cloudier lauder wieldier soldiery leadier louder aulder bloodier boulder eluder flutier cloddier colluder gladier moldier moulder mouldier soldier deluder shoulder
cloud cloudy clod cloddy clout clued could