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.
sill silly scilla sell silo zill sail sall soil selle sally sully zillah sallow sly sel sol sal sallowy slow sole seal sulu sale cell soli slaw saul slay sloe slew solo sola ceil syli soul slue seel selah solei ceili cella celli cello cilia seely
bill kill shill will dill vill hill ill gill jill fill maill quill mill nill pill rill sill zill till chill yill