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.
aboard abroad abort abrade aubrieta
board seaboard rubboard reboard teaboard aboard keyboard leeboard gabbard tabored beard debeard barde abroad bard byroad bared bored broad subarid boart tabard rebored labored