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.
seraph ceriph serf serif serve servo sorgho
graph paraph seraph teraph raphe curagh curragh morph morpho murphy ceriph
sera serai ser sear seer sere serow serry sierra sora suer sura surah user