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.
nutty nitty netty natty nut knotty gnatty nett knout not nit net gnat nite nowt nota nude newt note knot knit neat
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