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.
repent repaint reopened reappoint repand repined ripened repinned repugned
repent pent spent pant pend pint punt append sapient spend depend dipnet dopant upend
reopen repin repine repugn ripen arpen crepon trepan