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