The term "process plate" typically refers to a printing technique in which an image is created by combining multiple layers of ink or pigment. There are a variety of different synonyms that could be used to describe this process, including "color separation," "color key," "process color," "CMYK printing," and "four-color printing." Each of these terms describes a slightly different aspect of the process, but they all refer to the same basic idea of using multiple layers or colors to create a final image. Other related terms might include "halftone printing," "spot color printing," or "digital color correction," depending on the specific techniques being used.