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.
iffier
buffier chaffier leafier huffier daffier beefier miffier reefier puffier chuffier goofier defier reifier iffier deifier fer fir quaffer fiar kafir coiffeur bouvier livier fair offer giver fiery reoffer jiver feoffer naiver zaffer fire niffer heifer knifer riviere puffery duffer hoofer chiefer chauffer deafer chafer wiver wavier wafery reiver river diver buffer coffer piaffer gaffer deffer fiver quiver suffer zaffir refire afire refer aiver kefir riviera levier liefer defer fere savvier loafer fifer goffer siver lifer kaffir puffer roofer leavier rifer heavier affair reefer liver gofer fear safer vier gauffer differ jivier doffer wafer waiver whiffer woofer chaffer chaufer chauffeur chuffer shiver