Decolourize is a verb that refers to the process of removing or reducing color from something. There are several synonyms for this word, including bleach, whiten, fade, lighten, drain, and discolor. Bleach is a commonly used synonym for decolourize, especially in the context of removing stains from fabrics. Whiten and fade also refer to the process of reducing color, but they are typically associated with things that are naturally white or light in color. Lighten can be used interchangeably with decolourize, but it may also refer to making something less heavy or burdensome. Drain and discolor both refer to the process of removing or reducing color, but they may also have negative connotations.