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.
plash plashy plush palish pleach plushy polish
flash goulash slash clash plash calash lash flesh plashy slosh polish bullish bolshy coolish palish delish ghoulish clach tallish mulish dullish lush dollish galosh plush golosh slush flashy foolish flush hellish owlish blush leash relish welsh
pilau pilaw play plea pula splay