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.
sore soiree sere sori sure sire soar sora sour sorry siree saree sorrow surrey sirree souari sri ser sir cere sear sura zori seer suer sari sera cire serow serry sieur sirra surah surra saury zaire serai
bore fore shore wore whore tore dore sore pore ore more lore kore gore core chore yore re or