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.
peoples popples peplos peplus papules peepuls pipeless popeless populace populous pipals pupils
peoples polies fipples opals reapplies peles ripples napless nopales maples spales soapless supples couples zeppoles gapless hopples dapples capless dipoles hipless tipless hapless topless hooplas uppiles applies whooplas apples pules poles lipless poleis plews papules replies popples sapless nipples nopals maypoles spiles soupless supplies cupules pales zipless huipiles diploes copals duopolies piles tipples pleas topples hoopless wheeples plies shipless