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.
peepuls peplos peplus papules papulose populous pipals pupils peoples pipeless popeless populace popples
peepuls puls tepals sepals repulse repels peplus peplos cupules papules copulas appulse pulse pulls pulis pules wheeples