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.
petty piety petto petti putty potty peaty patty pet pity putt peat paty poet putto pieta putti pitta pouty potto puttie pattee puttee pattie ptooey pit ped put pat pot pate peed pied pita pout ptui
jetty petty netty tatty tutty suety ditty cutty peaty rutty putty catty patty shitty piety jotty nutty petto batty meaty kitty gutty gaiety chatty jutty nitty butty ghetto betta nett ratty potty gnatty natty fouette fatty knotty bitty petti moiety sett deity dotty titty witty chitty yett