I am an eight(1 2 3 4 5 6 7 8) letter word, everybody keeps me as a secret, my 2,3,4 is a name of an animal, my 4, 5,6,7,8 is a dangerous weapon, ladies cannot do without my 1,2,8, communication cannot establish without my 5,6,7,8 u nid My 1,2,3,4 to be a brilliant student. What am I???? SEND ME THE ANSWER.