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.
cretin creatin creatine cortin curtain cortina carotin cretonne carrotin carton gratin croton craton keratin gratine crouton cartoon greaten cartoony gratinee carotene cowritten garden gradin cordon cardon cardoon gradine grutten quartan gardenia guardian gueridon
cretin ratine serotine ceratin pertain martin gratine curtain reattain retain retina retine routine rutin ferritin hordein carotin carrotin cortin cortina creatin creatine gratin keratin martini protein certain serotiny
cared caret ocreate curt cart carte cored crate create cred credo creed cried crit cruet cured curet curette acred screed