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.
polyps polypus polypous palps plops pulps palpus palapas pileups pullups pulpous
polyps laps lops alps clips blypes fillips blips polypus salpas pulps slaps plops palps slops lollops dewlaps keleps tulips gulps whelps collops shleps galops lips flops palpus calypso juleps claps jalaps helps jalops flaps saleps pullups salps milpas flips slips kelps slypes kalpas dollops glops wallops clops shallops gallops yelps