There are several synonyms for the word "decolorize" that can be used in different contexts. Some of the most common synonyms include bleach, fade, discolor, and whiten. Bleach is often used to refer to the process of removing color from fabrics and surfaces, while fade and discolor are more general terms that can be used to describe the process of losing color or becoming discolored over time. Whiten, on the other hand, refers to the process of making something lighter in color, and can also be used to describe the process of removing stains or discolorations. Overall, these synonyms provide different shades of meaning that can be used to express the idea of removing color or altering the appearance of something.