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.
tufas tuffs tafias taffias tavs teffs dufus duffs tofus toffs tiffs tophus toughs typhus taffies toffees toffies typhous taphouse toughies difs doughface
tufas chufas fas ruffs duffs puffs pouffs muffs mafias maffias luffs luffas loofas loofahs kufis fays huffs cuifs buffs ofays poufs raffias sofas dufus tafias guffaws taffias tuffs cuffs guffs chuffs