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.
callas calls callus coalas callose cullays callees callous calos galls colas coals class galas culls clays cauls claws coalless galleass galliass gallus galeas koalas galahs clause caules calesa cullis classy caulis gallies gallows gallous cullies collies galleys gals cols coalesce goalless quillais kails cloys kolas gulls coles cools gaols goals cowls glass kills close kales clues glias gales coils clews quillaias quails coleus quills colies quells coulis quolls glassy kayles coolies killies gullies gulleys colossi coulees goalies kellies glassie queleas colessee coulisse keelless
fellas villas paellas scillas challas hollas ollas callas mullas chollas wallas las nills alas hulls phyllos hells fellahs ghylls alls fulls nulls follis cells hallos hilloas glass folles quillais gulls boulles mills wallahs moolas duellos jills phallus rills zillahs koalas nullahs callus fillos vills glias halloas belays molls kolas hillos halls galas ballsy bills cullays clays wells tellys tolas molas tuilles dalles hellos dahlias chills chalahs talas pilaws culls dolls chelas ills shells palls yells polls walls balas selahs filles bylaws dulls bells dells queleas balls sells ells slaws plays malls nalas quills kills talls jells rouilles fills relays zills blase lays leas flays knells bolas claws hollos pilaus galahs villus dulias alias failles slays mulls lulls challahs knolls tailles calls hallahs sills galls gills lase hulloas belles boylas flaws allays blahs bulls mullahs quells holloas bolls lalls lass blaws milles laws hills galeas coalas cullis rilles rolls mells cellos tills lolls class fleas moolahs colas falls gallus hylas hullos quolls jellos mollahs niellos violas fells pulls dills pleas tolls hulas tulles palais maills waylays dalasi pills tells wills challis doulas chillis cholas selles sheilas tallis shills delays yills
call callee callow calla coaly scall collie gally calo caul coal coala colly cully gall galley cull scale cullay scaly