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.
gooiest guest goosed coesite cost kist gust gast costa coast quest gusto coset gusty keyset cozied guised costae cosied cosset gusset cuesta gaseity gazette guessed gussied
gooiest zooiest fiesta foist hoist hygieist joist moist wriest siesta doest doughiest shiest