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.
blush bluish blueish bolshy bolshie bullish belch bleach blotch blotchy
lush flush slush plush blush tallish dollish slushy galosh lash foolish relish fluish plushy calash bullish plash owlish slosh delish bluish flash dullish flesh slash clash bolshy palish mulish coolish goulash ghoulish golosh hellish polish welsh