Intimidation is intentional behavior by a person that has another (or others) in fear of injury or harm.
Threatening (or more specifically: threatening actions/behavior) is the crime of when one, when knowing or with any intent, puts someone else in danger of bodily, emotional, intellectual/cognitive, sexual or financial harm or negative. Threats also include property damage, intent/planning to terrorize others and hating/condemning people of particular genders, races or ethnicity classes.
Intimidating another person is a crime in several states in the U.S. Intimidation related to hate, prejudice or discrimination often includes the following:
which annoys, threatens, intimidates, alarms, or puts a person in fear of their safety...because of a belief or perception regarding such person's race, color, national origin, ancestry, gender, religion, religious practice, age, disability or sexual orientation, regardless of whether the belief or perception is correct.