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.
kufis kafs kifs kefs guffs cuffs cuifs kaifs keefs kiefs kivas quaffs quiffs guffaws kiaughs quaighs guvs kvas
kufis cuifs chufas tuffs toffies taffies dufus deifies defies roofies raffias biffies buffs huffs jiffies cuffs baffies luffs ruffs waffies tufas tafias taffias duffs defis reifies guffs puffs poufs pouffs muffs mafias maffias chuffs