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.
potato potted patootie pated petit patted pedate petite petted pitted podite pouted putout putted puttied
potato tat state rotate vittate outeat outate nutate notate mutate metate guttate dato teat taut tattoo tate ditto datto ridotto stat stoat
pot pita poet potto potty pout pouty spot spotty