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.
guidons godowns guidance gaudiness goutiness cutins codons kidneys quietens goodness cutinise quietness codens cotans codeins cottons ketones kittens
guidons dons chitons udons radons odeons donas donsy downs adonis vodouns voudons voudouns hoedowns hoidens codons godowns lowdowns maidens nitons pitons redons widens showdowns