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.
slay sly sola slaw silly sully seely selah sally scilla sal sol sel sallowy sail sulu slue soul sell soli sole silo slow sill saul sale seal soil sloe solo seel sall slew syli cella cilia selle solei
lay allay belay flay clay cullay play relay slay delay waylay la