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.
applies apples appels appals appellees appalls appeals appulse applause appaloosa apollos
plies supplies reapplies replies applies hoopless maples couples polis popples papules nipples sapless gapless cupules pales fipples hipless hapless splice apples pulis huipiles plews zipless diploes duopolies tipples topples wheeples peoples ripples capless soupless supples spiles soapless piles hopples pilis pleas polies poles spiels napless peles pules spales lipless maypoles nauplius nopales zeppoles dapples dipoles tipless topless uppiles shipless
appal appall appel appellee apple apply