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.
rashly richly rachial rachilla racially rachillae racial retial
lushly poshly rashly mushily tetchily muchly richly shul gushily pushily patchily itchily pitchily gauchely shyly cushily fishily shily bushel shaly botchily bitchily bushily techily touchily
rash resh reshoe reshow rishi roshi rush rushee rushy brash brashy crash trash trashy