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.
potty pouty petty putty potto patty pot paty putt poet pout pity putti putto peaty piety petto pitta petti ptooey puttie puttee pattie pattee pod put pit pat pet pate peat pita pood ptui
jotty potty knotty dotty chitty potto titty mott netty fatty hooty butty bott booty bitty doty shitty putty kitty patty batty otto pouty ratty rotte sooty ditty witty lotto nutty tatty rooty tutty nitty footy gnatty motey lotte jetty natty motto chott gutty chatty jutty motte zooty gouty cutty cotta catty petty rutty shott