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.
opened opined oppugned
peened deepened reopened opened cheapened ripened happened lippened weaponed spend japanned spendy repinned panned punned peined pinned paned oppugned spawned spined opined depend deponed pend speaned pained ponied spanned pawned penned pined repined append spooned repugned upend