ASSASSINATION : Assassination is a killing some one with political or religious purpose.
e.g 1) Mahatma Gandhi was assassinated. (Political purpose)
2) John Kennedy was assassinated. (Political Purpose)
3) Saint Joan was assassinated. (Religious and political purpose)
MURDER: 1) Deliberate and intentional killing of one human being by the other.
e.g :The thief murdered the businessman for his money.
