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.
speedy speed speedo sped spaed spued siped spied soaped sipped sopped seeped sapped supped souped spud spade spode spite spate spado sapid sapote sippet sopite spotty zapped zipped
speedy peed beeped jeeped peeped seeped speed speedo wheeped cheeped
seep seepy sipe spae spew spue supe