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.
weighty weight wight weighed wifty waught weft whiffet
eighty weighty mighty nighty righty paughty fight tight night sight naughty righto right bight hight knight wright might dight light weight eight wight