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.
yapon yaupon yupon youpon
capon weapon yapon shapen youpon depone gipon spoon lapin coupon jupon japan pone poon pion peon paeon cheapen shippon pony upon yaupon yupon