Final answer:
The term 'communicator' refers to the party initiating communication in the communication process. The 'authoritarian' leadership style is characterized by top-down communication, where the leader dictates all decisions and processes.
Step-by-step explanation:
The individual, group, or organization that needs or wants to share information with another individual, group, or organization is referred to as the communicator. The communicator is the source or the sender in the communication process, initiating the message to be conveyed to the receiver.
Regarding the type of group leadership that has a communication pattern that flows from the top down, the correct answer is authoritarian. In an authoritarian leadership style, the leader maintains strict control over the team, often dictating tasks and processes and expecting team members to follow orders without input or discussion.