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.
annul annual annuli annal annually anneal anal anil anele anile anole anally
annul venule channel zonule runnel ranula pinnula manual lunula kennel gunnel canula cannula cannel veinule null funnel fennel biannual annuli annual annal lunule pinnal pinnule ronnel zonula tunnel chunnel