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.
wrapped rapped raped reaped repped ripped rapid riped roped wrapt rouped rapt repaid repeat repute roupet
happed rapped wapped dapped gapped capped sapped chapped wrapped zapped knapped tapped mapped whapped lapped yapped napped aped supped piped jauped bopped upped ripped lappet copped reaped caped chopped japed cupped repped dipped zipped tappet gaped tupped gypped tipped pipped hipped poppied leaped popped yawped heaped nipped whupped taped dupped lopped raped soaped gawped kipped fopped pepped mopped whipped shipped topped shaped gipped kepped whopped sopped sipped lipped chipped pupped quipped shopped hopped yauped knopped yipped ped
wrap rappee frappe crappie crappy grappa rap