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.
radon redon ratton redone ratoon radian rattoon ratan redan retain rotten ratine ratany ratten redden rhyton rattan ridden redeny ratteen routine reattain
radon don udon redone voudoun down tauon adown baton dona vodoun done voudon codon godown guidon laden leaden odeon hoedown lowdown redon deaden showdown
rad radii trad orad radio raid rato read readd ready redo road roadeo roadie brad irade grad grade ordo trade