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.
roofs roofies rifs refs reefs raffs ruffs reifs roves riffs ruffes refuse rufous roughs roughhouse raffias reavows reifies roughies revs roughhews
coofs loofs hoofs poofs woofs roofs goofs whoofs coffs sofas offs toffs oafs doffs coifs poufs loafs loofas howfs doofus feoffs tofus boffs dieoffs
roof roofie groove groovy prof proof