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