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.
shadows shads shades chads sheds shots shotts shoats shoots shotes shouts shiatsu shittahs shoddies chats shits shuts sheets shutes shiatzu
shadows meadows dows ados dowse adios fados vadose radios roadeos dadoes dados widows dos ads
shadow shadowy shad shade shady