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.
martin martini marten meridian
cortin martin burton verdin hearten carotin carrotin carton ferritin curtain creatine ratine partan pertain ceratin serotine tartan chorten cortina rutin gratine routine retina retain reattain creatin cretin gratin retine marten keratin quartan martini parton protein certain serotiny torten shorten
mart maraud marred married mort amaretti amaretto imaret smart smartie smarty