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.
welsh welch
welsh flesh relish plush palish mulish coolish golosh hellish calash ghoulish foolish flush fleshy dullish delish welch slosh lash leash clash slush slash polish plash owlish galosh goulash bullish lush belch blueish blush bolshy tallish dollish flash
weal weel well wellie welly swell dwell