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.
lapel lapilli loopily
lapel chapel cheaply spiel haply tupelo spell peel pele appeal appel speil peal maple papal rappel repeal repel ripely speel cupel shapely
lap leap lipe lope flap flappy clap slap