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.
nerdy nerd neared nereid nard neuroid nurd gnarred knarred
nerdy perdy ready corody corrody curdy greedy grody queered jerid nerd reedy sered tiered weirdy cheered sheered leered pardy herd parody veered bready beard lardy merde jeered hardy perdu heard peered cered tardy weird wordy cherty sherd