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.
keypals copals cupels copulas cupolas
keypals pals tapalos spales sepals pipals opals nopals nopales copals appeals appals appalls peals pawls palsy palls pales pails repeals spails spalls tepals