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.
coughers covers coffers gophers coiffeurs coiffures cavers gofers gaffers goffers quavers quivers covaries gauffers quaffers kefirs
coughers laughers roughers sighers weighers gophers ciphers cyphers spheres syphers