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.
regress regrows recross raygrass requires recarries rookeries rockeries rogueries recurs rakers rigors rackers reekers riggers rigours rockers ruggers recourse rigorous wreakers wreckers
egress ogress regress tigress digress aggress grass figures gross caress puggrees cress cressy gores grues pugrees ligures agrees greys puggries raygrass eagres grees degrees ogres