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.
liefly lively lovely levelly lawfully level lawful
liefly refly chiefly fly beefily flay wifely waeful dayfly suavely rifely saveloy feyly vealy refel puffily felly fley ruffly novelly lively rueful goofily safely levelly sawfly naively daffily lovely deafly mayfly waffly woeful huffily ravelly shoofly
lief leaf leafy lieve life live alef alif clef cliff cliffy gliff slieve