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.
role rule rale roll rile roil rouille rouleau reoil rille riley roily rill ruly riel rial rely real reel rail rally rawly relay wryly
bole vole haole hole jole cole mole ole pole role sole dole tole whole