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.
helps heelpiece
helps whelps yelps kelps pileups fillips clops flips flops jalaps jalops blips juleps clepes shallops gallops milpas palpus plops pullups saleps salps sleeps slops dollops wallops shleps lips flaps claps palps clips collops alps galops gulps beleaps keleps polyps glops pulps leaps salpas slaps slips dewlaps tulips kalpas lops laps shlepps lollops bleeps