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.
nitty natty nutty netty nit knotty gnatty nite nett knit net not nut knot newt nide nidi nodi nota note nowt gnat neat
bitty nitty ditty witty shitty kitty chitty titty mitt potty laity pitta dotty gnatty fatty nutty whity catty netty knotty city jutty whitey gaiety moiety ditto rutty cutty putty pity piety patty batty butty vitta ratty jetty petty natty bitt deity jotty mity tutty tatty gutty chatty