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.
raffs raffias ruffs riffs ruffes refs rifs reefs raves roofs reifs refuse raphis reaves raphes rufous raphias reavows reifies roofies revs
caffs waffs baffs naffs quaffs yaffs raffs chaffs gaffs daffs sheafs cafes ruffs duffs puffs buffos jiffs luffas guffs bouffes diffs kafs huffs safes haafs miffs leafs riffs ruffes luffs feoffs howffs whiffs coiffes effs piaffes boffs boffos buffs quiffs cuffs dieoffs tuffs doffs tiffs muffs loafs teffs naifs toffs gaffes oafs pouffs offs pouffes kaifs biffs waifs chuffs chafes coffs
raff raffia riff ruff ruffe draff draffy