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.
gratin gratine gratinee gradin creatin keratin gradine greaten creatine craton cortin cretin grutten carotin cortina curtain carrotin guardian gueridon garden carton croton cartoon crouton guerdon quartan carotene cartoony cretonne gardenia
creatin gratin keratin ceratin serotine protein rutin carrotin cortina carotin martin curtain ferritin greaten routine craton ordain pertain ratan retina retain reattain ratine cretin gradin creatine martini retine reordain gratine cortin certain serotiny
grat grate crate grad grade great grit gritty groat grot grotto grotty