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.
crudity credit cordite gratuity cordate gordita crudded cardioid crawdaddy curded crated carted carded corded courted crawdad created crowded curated curtate gradate carotid gritted grouted
crudity aridity hybridity erudite fortuity viridity heredity gratuity preaudit torridity
crud cardia cardiae cardio cruddy crude