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.
potash padshah pettish potiche padishah petechia
potash stash wettish dashi pettish loutish latish goatish cattish hottish dash fetish rattish attach tosh tach deash dashy fattish reattach sottish tush ruttish detach whitish
pot pita poet potto potty pout pouty spot spotty