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.
soiree siree sirree sore sire saree sir sori cire sour sure seer sere sora soar sieur sirra sorry zaire sierra sirrah sorrow souari surrey zooier ser sri
siree soiree hiree ire ree mire feirie dree bree zaire lire laree bourree sire quire sirree chirre tree hire saree cire areae moire puree free fire vireo dire gree tire pree wire shire