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.
syphers cyphers spheres ciphers sighers savers severs sivers suffers zephyrs savors sofars safaris saviors savours zaffers
gophers ciphers cyphers syphers ephors coughers laughers roughers sighers spheres zephyrs tephras weighers shophars