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