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.
moas mas mos mays mass mows maes moos moss maws masa mouse massa masse mosso mossy massy moose mousy meows moues mosey meous miaows miaous mousey mousse mus mis muss miss miso mesa mazy mace mozo maze mise mess muse mews maize messy mezzo missy mussy