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.
refs reefs reifs refuse rifs revs reifies raffs roves rives riffs raves ruffs roofs reaves reeves reface raphes revues revise reives ruffes rufous raffias reavows reviews roofies roughies roughhews
beefs efs fiefs keefs kefs kiefs reefs refs chefs chiefs