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.
putty putt pouty patty potty petty putti putto put puttie puttee pity paty pout piety potto peaty petto pitta petti pattee pattie ptooey pit pet pat pot pud pate peat pita poet ptui
butty putty cutty nutty jutty rutty gutty tutty suety knotty nitty butte kitty ditty duty gnatty putto butt petty netty catty pouty cutey gouty chitty bitty patty fatty mutt jotty gutta batty putti jetty potty dotty tutti witty sutta beauty ratty putt natty titty chatty tatty shitty