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.
coala coal cola calla coaly koala col caul gala calo goal cool kola claw coly cole coil clay cowl call cooly coyly galah galea colly coulee callee collie cullay qualia goalie galeae coolly callow coolie gal gale kolo clew cloy clue cull gall gaol kale koel kohl kail
coala koala ala moola tola doula sola palea nala boyla alae bola foal viola voila joual chalah chola shoal qualia holla calla gala galea olla walla tala coal zoeal goal cholla challa realia galah moolah cola mola coaly kola shoaly