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.
muggur muggar mugger muggier maugre mucor mucro maigre meagre megara mucker muckier
muggur beggar figure vaguer eggar bugger egger muggar nigger guar rigger leaguer rugger logger kegger sagger jogger dagger jaguar dogger voguer tugger hugger chigger fogger bigger bagger lugger guru agger vigour augur augury aggro mugger puggry nagger rigour ligure gaur saggar lagger seggar gagger digger jigger tagger hogger wagger jagger chugger
mugg muggee muggy mug migg moggie moggy smug