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.
grutten greaten cowritten garden gratin gratine crouton gratinee gardenia carotene carton cortin gradin craton croton cretin carotin cartoon cortina creatin curtain gradine guerdon keratin quartan
grutten ratteen ratten rotten written cowritten rewritten
gritty grotto grotty grout grouty