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.
lapin lipin lupin lupine lippen loupen
lapin pin pine pina pian pein pain papain pippin piny repin cioppino spine supine weapon chopin shapen rapini pion apian rappini capon lipin lupin lupine opine pepino rapine japan repine spin spiny tiepin cheapen chopine yapon
lap leap flap flappy clap slap