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.
toughies toughs tophes toffies tofus tophs doughface tophus typhous taffies toffees taphouse tiffs teffs tuffs tufas toffs doves dives davies defies doofus tafias typhus
toughies roughies ghis ghees hives gives sophies chiefs chives shives