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.
seer ser sere suer sera sear siree serry sieur serow saree serai sierra soiree sirree sri sir sore sura cero cere sour sora sori soar sire sari sure zero ceria saury sirra sorry surah surra
beer veer jeer queer leer peer seer deer weer cheer sheer er