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.
patty paty petty putty potty peaty pat pattee pattie pate putt peat pity pitta paddy petti putti piety petto putto pouty potto puttie ptooey puttee payday pot put pad pit pet padi paid pita poet pout ptui
fatty chatty batty tatty ratty patty natty gnatty catty att satay potty rutty matt battu paty nitty laity putty matey bitty batt gutty jetty witty kitty chitty beauty watt peaty knotty ditty latte jutty petty netty butty matte cutty tutty nutty jotty meaty datto titty dotty bawty shitty