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.
guidon godown codon cutin gotten kidney quieten
guidon don chiton udon redon piton niton maiden lowdown godown codon hoiden voudoun hoedown voudon vodoun adown down done dona odeon radon redone widen showdown
guid guide gaud gaudy gude quid