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.
rill rille rail rial roll riel roil rile rouille riley reoil roily rally really rale real reel rely role rule ruly rawly relay wryly
bill kill shill will dill vill hill ill gill jill fill maill quill mill nill pill rill sill zill till chill yill