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.
caddy cuddy cad caddie cade cadi caid gaddi kiddy catty gaudy cuddie cod cat cud gad cate coat coda coed cued gadi gaed gaud goad kadi code qadi qaid quad
baddy caddy paddy daddy waddy faddy add ready duddy toddy didy soddy biddy neddy gaudy lady toady midday middy gaddi shady teddy widdy fuddy wady readd giddy kiddy beady heady buddy muddy cuddy leady eddy bawdy ruddy noddy shoddy