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.
taffias tafias taffies toffies toffs tiffs tuffs teffs tufas daffs toffees tavs diffs doffs duffs divas tofus defis davies defies deifies dieoffs diffuse diphase
raffias maffias taffias baffies biffies jiffies guffaws luffas mafias taffies tafias toffies waffies fas