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.
pileups pullups palps plops pulps palpus polyps palapas polypus pulpous polypous
pileups leaps loups lupus beleaps bleeps juleps clepes keleps pullups saleps sleeps chalupas shlepps shleps