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.
knopped knapped napped nipped kneepad nepeta
bopped shopped hopped lopped mopped copped knopped chopped topped popped fopped whopped sopped oped coped sapped mapped tupped looped kepped gapped hooped cupped napped rapped poppet whooped quipped gypped sipped pupped yapped whupped capped knapped upped dupped shipped dipped zipped louped pooped chipped copied kipped doped soaped supped hoped loped poppied wrapped moppet nipped gipped tipped lipped happed ripped moped souped cooped repped hipped dapped pipped toped couped lapped chapped whipped tapped wapped roped pepped zapped whapped rouped piped yipped ped