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.
heels hells heals helos heils heelless helios hellos hueless helloes hols hales hails hills halos hulls halls howls holes hulas hauls hilus hullos hollos hallos holies hoyles hollas haloes hillos haoles holloas halloos hulloes holloos hilloas hallows holloes hollows halloes hilloes hollies hulloas halloas hallahs hulloos
eels feels wheels seels heels peels keels teels kneels reels els fuels allees teals peals flees noels koels teles else peles seals chelas jells meals glees sels gels tels shiels shells helos chiels ells riels tells duels mels doolees dells deles bailees cels knells deils zeals delis mallees bells wells veals reals hells callees quells pollees melees wheals ceils taels telos fells deals cells heals sells heils mewls dels gelees lees veils weals coulees mells sheals bels sheols yells
heel heal heil helio hell hello helo