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.
supped sipped sapped souped sopped sped speed spued spaed siped spied zapped seeped sippet speedy speedo soaped zipped spud spade spado spate spite spode sapid sapote sopite
bopped whupped repped chapped gapped mapped fopped hipped lapped tapped sipped copped happed chipped kepped zipped tupped hopped pepped zapped napped lipped whapped sopped rapped tipped mopped shopped yipped capped yapped popped chopped shipped knapped topped wrapped knopped lopped gipped kipped gypped dipped ripped pipped pupped dupped quipped sapped whipped wapped whopped dapped supped nipped upped cupped ped souped biped whooped duped heaped rouped poppied peed gaped soaped leaped hoped louped whippet sped peeped gawped puppet typed raped cheeped jeeped coped reaped spued tippet cooped wiped copied yawped hooped beeped piped pooped shaped spied lappet moped speed siped pied hypoed riped doped moppet aped sippet hyped caped poppet roped couped jauped toped japed seeped oped spaed loped looped yauped taped tappet wheeped
sup sappy soppy soup soupy supe