CRW stands for Canon Raw Image format, which is a type of digital image file used by Canon cameras. When talking about synonyms for CRW, it is commonly referred to as a "raw" image format. Other synonyms can include "unprocessed" or "original" image format, as the CRW file contains all the data captured by the camera's sensor with little to no processing. Some may also use "RAW file" or "digital negative" to describe this format. Regardless of the exact term used, CRW files offer photographers a lot of flexibility and control in post-processing, making them a popular choice for many photographers.