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.
leafier leavier leaver levier loafer lifer liver lever laver laveer liefer liever livery livier laugher lover louver
leafier beefier safer reefier piaffer miffier quaffer aiver afire buffier goofier fifer deifier wavier wafery chaffer deafer chaufer zaffir fiery heavier huffier reifier puffier naiver loafer kafir kaffir leavier gaffer fiver iffier defier waiver wafer chafer daffier chaffier zaffer chuffier fer fir