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.
redon redone redan radon redden redeny rotten rhyton radian ratoon ratton retene ratten retina retain retine retune ridden ratteen rattoon retinae retinue written reattain
redon don udon sedan vodoun guidon godown codon jeton hoedown voudoun voudon dona lowdown beton adown down done odeon redan phaeton radon redone seton showdown
redo red uredia ordo cred ired brede bred rued reedy rediae reed redia rede redd ready readd read credo reroute uredo