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