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.
colly coolly coly cully cooly coyly golly coaly col cullay collie call cool clay cowl coil cloy coal cola cull cole kelly calla gally coala quoll gully gulley callee coolie coulee galley callow gall kolo claw kohl gaol clue gull caul gley kill goal clew kola calo koel
folly coolly knolly dolly jolly colly woolly holly golly wholly molly lolly boll foley mulley galley jelly knoll quoll lowly leally olla belly kelly hollo really bully nelly willy coaly alloy valley welly shelly chilly wooly toll tally dually dooly coyly hilly noily loll mooley fully lily pulley poll gully dilly ally gally roll sully roily filly cullay sally felly alley holey cooly poly dally gilly silly moly foully pally billy holla coly illy bally hooly doll jowly rally volley cully moll holy allay doyly doily dully telly wally delly oily gulley chally cholla shoaly