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.
cangue gangue congou gang conga congo cuing kiang cooing cueing gaeing quango cooeeing
cangue gangue langue dengue tongue nuke congou lingua linguae manque mongoe cinque
can cain cane canna cannie canny canoe scan