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.
wecht waucht watchout whisht washout watched witched witchhood
echt wecht chat chit fitchet hatchet cachet latchet licht rachet ratchet rochet sachet waucht chitchat yacht