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