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.
hire hiree hair hare heir here hairy her hero haar hoar hear hora hour hoer harry herry hoary horah houri hurry
fire hire ire quire lire mire moire cire sire zaire dire tire wire shire re