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.
must musty mustee mist most mast musette maist mayst misty moste moist mused mestee miseat misate muscid misset moused mussed miscite misseat missout missuit moussed misdo mucid mysid
bust joust just gust lust must oust roust rust dust