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.
cheapen shapen chopin shippen chopine shippon
cheapen happen keppen rappen reopen deepen weapon shapen pen
cheap cheapie cheapo chap chape chapeau chappie cheep schappe