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.
toffees toffies toffs taffies teffs tuffs tiffs tofus doffs tophes taffias dieoffs toughies diffs tufas daffs tophs duffs doves deaves defies doofus tafias tophus toughs deifies diffuse typhose typhous
coffees toffees feoffees fees toffies baffies biffies bouffes fifes jiffies coiffes piaffes pouffes ruffes taffies gaffes waffies fes