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.
godown codon guidon coden codein cotton gotten codeina codeine cottony
adown down lowdown showdown hoedown godown don guidon udon codon redon towny odeon dawn dona vodoun voudoun voudon radon town redone done downy
god goad good goodie goody gowd