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.
affair affaire afar afire affray afore aiver aviary
affair fair far fir afire kefir beefier miffier buffier reefier afar iffier reifier sofar affaire zaffar daffier deifier chuffier kaffir refire vair fare fiar kafir fear leafier faro puffier fire fairy goofier safari huffier suffari zaffir defier chaffier shofar