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.
papulose papillose papules populous peplos peepuls populace peplus pipals pupils peoples popples pipeless popeless
papulose pilose pulse appulse papillose populous repulse
papula papulae papule papal papally papilla papillae