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.
paty peaty patty pat pity peat pate potty paddy putty petty pouty piety pattie ptooey payday pattee pot put pit pad pet poet padi putt paid pita ptui pout petto pieta pitta podia potto putti putto petti