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.
bourtree bordure bordereau barter border boarder breeder barrater barratry barretor barretry brattier brighter birder
bourtree retiree nurture tartare torture
bort boart borate borty bourride buret burette abort