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.
teardown drawdown tartan triton tartana tortoni turdine torten
teardown radon redon bourdon fordone cardon cardoon cordon guerdon gueridon lardon lardoon pardon drawdown
tardo tardy tared teared teredo tread stearate