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.
mighty might
eighty mighty weighty paughty righty nighty naughty sought knight might night ghat right aught nought eight wrought waught caught light naught fight tight ought fought sight dight wright bight righto hight weight taught wight