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.
peplus peplos peepuls peoples populous pipals pupils popples pipeless popeless papules
plus peplus pols pals poilus pilus pilous pileus opals pilaus copals lapels cupels nipples appals popples pupils repels sepalous supples tepals topples whooplas maples puls apples appels hooplas hopples huipils couples keypals lapillus fipples nauplius nopals peplos peepuls peoples pipals populous rappels ripples sepals dapples tipples wheeples chapels