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.
palish polish plash plush plashy plushy pleach
foolish bullish mulish dullish delish polish owlish ghoulish tallish relish coolish palish dollish hellish clash blueish lush goulash galosh slush slash flash blush fluish flush flesh calash plush bolshy bluish slosh lash golosh lich plash welsh
pal pally spale papillae opal polio plie pili pial peal pawl paly pallia paella pall paleae palea pale pail puli papilla spail spall