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.
pets peats poets pietas petsai peds puts pats pots pits pieties poetess poetise potsy pedes pates patsy pouts pitas putts potsie pittas pities pottos patois pitsaw patties poetize putties puttees piteous potties paddies pads pods puds putz padis poods
beets keets whets weets duets deets sets poets pets nets meets lets leets quiets jets bets gets hets haets vets fets rets suets diets tets wets sheets