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.
eureka euroky erica erg
eureka phreak charka drek parka markka marka greek creek creak freak reck burka break areca wreck wreak reek dreck trek shriek