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.
hertz hearts heriots hearties harts herds hurts heredes haeredes
hertz nertz ritz bortz fritz verts quartz nerts cherts
hart heard heart hearty heired herd hereat hereto heriot herried hurt