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.
clips claps clops calipees clepes calliopes callipees collops clypeus calypso collapse glops gulps kelps galops kalpas keleps gallops kelpies
lips fillips blips clips tulips slips flips ellipse flaps palps helps lollops gallops flops dewlaps salps wallops alps clops keleps slipes slops dollops plops gulps shleps talipes shallops pulps palpus lops juleps kelps claps galops glops collops jalaps polyps whelps salpas slaps saleps jalops pullups laps kalpas milpas yelps
clip calipee clap clepe clop clypei culpa culpae