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.
roll roil rill role rouille reoil rally rille roily really rouleau reel ruly rial real rule rail rely rile riel rale rawly relay riley wryly
boll quoll loll moll knoll poll roll doll toll