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.
stash sottish soutache stich stitch sideshow
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
satay stoai toast setae staw stay stoa stoae seta sayst sassed seaside tasset taste tasty tawsed teased toasty