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.
biffies baffies biffs bouffes baffs boffs buffs bevies biface boffos buffos beefs beeves
baffies jiffies biffies waffies toffies taffies coiffes gaffes roofies raffias bouffes feoffees fiefs fifes fives suffice piaffes coffees pouffes reifies ruffes defies taffias maffias deifies toffees office fes