Cyberwar as a noun is cyberwarfare. while Cyber-terrorism as a noun is the deliberate, large-scale disruption of networks of computers, especially of personal computers attached to the internet, by means of viruses etc.
Part of speech: noun
Definition: Cyberwarfare.
Part of speech: noun
Definition: The deliberate, large-scale disruption of networks of computers, especially of personal computers attached to the Internet, by means of viruses etc.
We hope you now know whether to use Cyberwar or Cyber-terrorism in your sentence.