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.
teffs tiffs tuffs toffs toffies toffees dieoffs taffies taffias daffs tufas defis duffs tofus doffs diffs defies defuse tafias tophes deifies diffuse toughies devs difs tavs
teffs effs efs neifs boffos biffs beefs baffs leafs bouffes coiffes gaffes guffs kefs luffs pouffs caffs raffs piaffes refs riffs ruffs daffs dieoffs doffs quaffs buffs toffs waffs chaffs chiefs sheafs muffs buffos quiffs gaffs chefs tiffs tuffs miffs fiefs luffas howffs huffs jefes jiffs coffs feoffs cuffs whiffs keefs chuffs kiefs naffs boffs offs pouffes puffs reefs reifs ruffes seifs defis diffs duffs yaffs
teff taffia taffy tiff toff toffee toffy tuff