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