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.
hour houri hoar hoer hora hurry horah hoary hurray hoorah hurrah hooray her here haar hare hear hero hire heir hair hairy harry herry hiree
four hour giaour lour our pour sour dour tour your or