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.
nigglier niggler knucklier nuclear knuckler
gigglier wrigglier wagglier jigglier wigglier gogglier uglier nigglier wiggler kegler goggler knucklier boggler regaler jugglery coalier collier giggler toggler sicklier joggler squallier likelier gluer colliery juggler haggler bugler glair wriggler scalier ogler gluier higgler niggler hacklier weaklier