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.
barrel barely borrelia barley barlow boreal barilla byrl birl burl brawl burly birle beryl boral brail brill broil brillo brolly burial burley brawly braille brawlie burghal
barrel parrel sorrel quarrel ferrel carrel reel cruel sorely saurel corral rarely sorel cereal boreal parral carrell morel purely loreal choreal real surreal oriel irreal ariel rely riel laurel barely jurel areal direly creel surely pyrrol gruel merely ureal yarely
barre barrow barrio bar brr brrr burry burrow burro burr birr borrow boar berry bear bare kbar