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.
fireless furless fearless farles ferrels ferules virelays virelais ferrules furls farls virls ferals frails frills ferlies ferulas varioles
fireless tireless treeless ireless shoreless coreless careless cureless wireless cheerless juryless oarless doorless merles berryless earless fearless arrowless areoles browless crewless rayless barless weariless airless braless reales carless furless morelles heirless relies peerless creoles aureoles tearless gearless trailless hairless warless