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.
gnawn nan naan nana known nanny nannie nun nene neon nine nona none noon noun
gnawn nan naw awn nana shawn naan dawn known sawn pawn fawn mawn fawny awny gnaw snaw lawny tawny lawn yawn