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.
carotin carrotin carotene cretin croton cortin carton cardon cartoon cortina cardoon crouton creatin cartoony creatine cordon gratin craton curtain gratine keratin quartan cretonne gratinee guardian cowritten garden gradin gradine greaten grutten guerdon
carotin carrotin serotine ceratin rutin ferritin cortin cortina cretin croton curtain gratin keratin martin martini pertain protein proton certain serotiny
cart carat carate caret carrot carroty carte croute garote garotte acaroid ecarte scart scrota