accessory (EN)
noun, adjective

noun “accessory”

sg. accessory, pl. accessories
  1. an item that adds to the usefulness or appearance of something else but isn't necessary
    She bought a new phone case as an accessory to match her handbag.
  2. an item such as a belt or bag that you wear or carry, which complements your outfit
    She added a colorful scarf as an accessory to brighten up her outfit.
  3. a person who assists in a crime or helps protect someone who committed a crime from being caught by the police
    He was charged as an accessory because he hid the stolen goods for his friend.

adjective “accessory”

accessory, non-gradable
  1. helping in a minor or secondary way
    The small flashlight was an accessory tool that helped during the night hike.