Here's the harassment law of Nevada. It is found in
Harassment: Definition; penalties.
1. A person is guilty of harassment if:
(a) Without lawful authority, the person knowingly threatens:
(1) To cause bodily injury in the future to the person threatened or to any other person;
(2) To cause physical damage to the property of another person;
(3) To subject the person threatened or any other person to physical confinement or restraint; or
(4) To do any act which is intended to substantially harm the person threatened or any other person with respect to his or her physical or mental health or safety; and
(b) The person by words or conduct places the person receiving the threat in reasonable fear that the threat will be carried out.
The first harassment offense is a misdemeanor under your law. If there's a subsequent violation, it's a gross misdemeanor.