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.
redan redon redone retain redeny redden radian reattain radon ratan rattan rotten ratoon retune retina ratten ratany retene ratton ridden retine ratteen rattoon retinae retinue written
redan sedan dan dawn dean median radian redon soudan hyoidean
red redia uredia treat dread oread credo create brede readd ready reata redd rede read redo rediae reed reedy rued bread bready bred ired cred great reared tread treaty uredo