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.
gaffer gauffer goffer quaffer gofer coffer kaffir goofier coiffeur caver kafir gopher quaver cougher quavery coiffure
feoffer chaffer suffer buffer niffer offer goffer puffer chauffer gauffer chuffer zaffer duffer piaffer reoffer quaffer gaffer coffer deffer differ doffer whiffer fer coiffeur wafer miffier zaffar feoffor iffier puffier reefier liefer deifier defier rifer daffier knifer buffier lifer loafer wafery fear chaufer hoofer chauffeur deafer reefer zaffre kaffir defer gofer puffery fere roofer reifier beefier refer safer woofer zaffir heifer leafier goofier chafer fifer chaffier chiefer huffier chuffier