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.
frowzy frowsy frouzy furzy frows froze frizzy furrows farrows friz farcy furze frays frizz froes faros vrows forays freeze frieze vrouws ferrous foresaw furioso furious ferreous
frow fro faro forwhy froe vrow