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.
safely sawfly saveloy suavely savvily seafowl souffle
safely rifely wifely fly refuel saveloy feal felly ruffly refly puffily deafly flay feyly refeel liefly refell suavely dayfly defuel waffly chiefly lovely naively feel biofuel huffily sawfly refel novelly mayfly lively daffily ravelly goofily duffel befell beefily fuel vealy fley levelly fell shoofly