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.
grainier grainer grinner groaner greenier garner greener granary cornier greenery corner kroner coroner crooner crowner careener kronor kronur
rainier brinier brainier grainier runnier drainer barnier pornier brannier loriner brawnier greenier ruiner grainer fernier cornier briner furriner grinner brownier mariner vernier dernier hornier trainer
grain grainy gran grin grana grannie granny groan groin