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.
tiffs teffs tuffs diffs toffs dieoffs toffies difs diffuse taffias taffies toffees daffs duffs tofus tufas doffs tafias deifies toughies tavs
biffs quiffs miffs tiffs jiffs diffs riffs whiffs ifs huffs buffos duffs luffs dieoffs muffs feoffs howffs difs gaffes doffs naifs reifs piaffes caffs offs puffs pouffes rifs ruffs daffs coiffes teffs waffs chaffs kaifs chuffs bouffes waifs raffs neifs effs seifs ruffes buffs guffs baffs cuifs coifs coffs cuffs kifs knifes toffs luffas quaffs fiefs pouffs boffs fifes gaffs kiefs boffos tuffs wifes chiefs naffs yaffs
tiff diff taffia taffy teff toff toffee toffy tuff stiff stiffie