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.
groggier groggery craggier croakier grigri grugru corkier croaker crooker creakier crockery crookery greegree quirkier corker
braggier froggier craggier groggier draggier dreggier druggier rigger rugger bragger groggery priggery progger dragger trigger