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.
sal saul seal sall sail sale sally sallow sly sel sol sallowy slue zeal sell soli slay soul sill sulu slew sola soil slow sole syli slaw silo solo seel sloe seely selah selle silly solei sully zoeal scilla