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.
keratin gratin creatin gratine creatine gratinee craton cortin cretin gradin cortina greaten carotin curtain gradine carrotin gueridon carton croton cartoon crouton guerdon quartan
gratin keratin ceratin craton gratine gradin curtain cretin creatine creatin pertain ratan cortin cortina carotin ferritin rutin ratine martin ordain reordain carrotin martini certain
karat karate korat krait kraut