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.
dragger draggier dreggier druggier trigger darker dorkier tracker trocar turgor torquer trekker tricker trucker
dragger bragger rigger rugger braggier froggier craggier groggery groggier priggery progger draggier dreggier druggier trigger
draggy drag dreggy druggie druggy