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.
pooped popped poppied piped peeped pepped pipped poppet pupped pipet pupate puppet pipette
hooped moped loped whooped coped toped hoped cooped doped oped roped pooped looped ped siped couped gipped pipped cupped caped gapped beeped mopped kepped pooed peeped speed bopped pepped rapped quipped knapped spued raped aped dapped soaped japed tapped tupped yawped yapped shipped chopped cheeped wiped whopped whipped whapped upped dupped zapped popped peed spaed biped fopped repped riped hyped pupped lipped nipped spied reaped hipped zipped gawped copied supped jeeped lopped pied jauped heaped gaped poppied hypoed wrapped gypped mapped capped leaped hopped copped louped napped sipped kipped taped sopped souped happed lapped rouped piped ripped sapped dipped knopped sped tipped duped topped typed wapped wheeped seeped whupped chapped chipped shaped shopped yauped yipped
poop pop pope poppa poppy epopee epopoeia