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.
tafias taffias taffies tufas toffies tavs toffs defis daffs divas teffs tiffs tofus tuffs davies defies deifies diphase toffees taphouse toughies
maffias tafias raffias mafias taffias fas fays kufis reifies baffies defies raphias vivas loofahs jiffies deifies chufas guffaws sofas kivas tufas waffies biffies roofies taffies ofays toffies luffas defis loofas divas shivas