When the nurse in charge is telling one of the patients that the LPN (Licensed Practical Nurse) is not doing her duties the way she should be, you accidentally overhear it. The best legal term to describe this is:

When you utter something malicious that can damage someone’s reputation is called slander.  When someone is treated unfairly because of prejudice is called discrimination.  Insubordination is the refusal to obey the orders of a figure of authority.  Although the head nurse is gossiping, this is not a legal term.