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.
sour souari sore suer sure sora soar sori sura sieur surra saury surah sorry soiree surrey sorrow ser sri sir sere seer sari sire sear sera zori saree serai serow serry siree sirra
four hour giaour lour our pour sour dour tour your or