Auto-pilot refers to the ability of a machine or system to function without constant human intervention. However, there are a variety of different words that can be used as synonyms for this term. For example, the word "automated" refers to something that is controlled by a computer or machine rather than by a human operator. Similarly, the term "self-driving" can be used to describe a vehicle or system that can operate on its own without the need for constant input from a human driver. Other possible synonyms for auto-pilot might include "programmed," "remote-controlled," or "autonomous," depending on the context in which the term is being used.