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.
deafly dayfly daffily defile deflea defuel devalue dewfall devel devil duffel duffle teughly
deafly fly chiefly waffly daffily liefly dayfly sawfly ruffly refly puffily ovally navally mayfly coevally safely cavally flay jovially huffily beefily vealy fley rifely goofily wifely shoofly
deaf def daff daffy deave defi defy deify deva