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.
kaffirs kafirs kefirs gaffers gauffers quaffers caviars coffers goffers caviares coiffeurs coiffures cavers gofers quavers quivers
kaffirs zaffirs firs duffers differs defiers coffers refires niffers fiars piaffers fires affairs buffers feoffers fairs chaffers reoffers feoffors gaffers zaffars whiffers doffers kafirs deifiers goffers zaffres gauffers kefirs zaffers suffers reifiers puffers offers quaffers chauffers