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.
spaed sped spado speed spued spade spate spied siped supped speedo seeped souped sipped speedy sopped soaped sapped spat spud sapid sputa spite spode spait septa sopite zapped sapote sippet sapota zipped zapateo sept spit spot
spaed ped pad keypad gaped siped oped copied pepped looped jauped couped hopped sapped biped heaped wiped yapped ripped chopped upped gypped whipped dupped capped toped spued cooped dapped bopped gawped spate pipped yawped shipped cheeped whopped whapped tupped tapped doped zapped speed caped rouped spado souped repped quipped popped hooped raped beeped happed mopped napped leaped reaped mapped lopped pupate kneepad soaped fopped nipped lipped knapped pupped coped copped pooped rapped gapped louped hoped hipped aped piped peed sped paid peeped spade lapped roped japed seeped gipped hypoed cupped jeeped pate moped knopped padi repaid kepped loped wrapped riped sipped zipped sopped duped hyped tipped taped poppied topped kipped wapped supped wheeped dipped whooped whupped pied chapped chipped spied shaped shopped typed yauped yipped
spae spa sipe spay spew spue supe