The term 'PENGUIN's Nemesis' can be solved by the 6-letter word 'BATMAN'. BATMAN is a fictional superhero created by Bob Kane and Bill Finger, first appearing in Detective Comics #27 in 1939. He is a vigilante who fights crime in Gotham City and is one of the most iconic and popular characters in comic book history. The PENGUIN, also known as Oswald Chesterfield Cobblepot, is a supervillain and archenemy of BATMAN. He is a master criminal with a fondness for birds who has been featured in various media adaptations of BATMAN.