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.
haughtiness headiness hotness heightens hiddenness hoddins hoidens
haughtiness doughtiness wittiness tattiness sootiness rootiness dottiness ruttiness pottiness bittiness fattiness hotness jettiness battiness goutiness matiness meatiness knottiness nattiness nuttiness pettiness cattiness whatness chattiness tines tineas