A subduction zone refers to an area where one tectonic plate moves under another in a process known as subduction. The term "trench" is used to describe a type of subduction zone that forms a deep underwater canyon. Another synonym for a subduction zone is "convergent boundary," which refers to the area where two plates come together. A "megathrust zone" is another term for a subduction zone that experiences significant earthquakes due to the movement of the plates. Other synonyms for subduction zones include "subduction boundary" and "subduction fault." Understanding subduction zones is critical in predicting natural disasters, such as earthquakes and tsunamis, that can occur in these areas.