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.
hapless hipless hoopless hopeless hopples huipiles hooplas huipils
hipless lipless zipless topless soapless hapless napless shipless tipless capless gapless hoopless sapless soupless apples spales pipeless ripples plies poles hopeless replies nopales maples dapples supples papules popples pleas pules uppiles hopples shapeless diploes plews pales peoples huipiles spiles fipples peles couples applies piles nipples dipoles zeppoles cupules reapplies supplies popeless tipples topples tapeless wheeples maypoles