According to my observations on the ground, anarchy is a decentralized definition, but decentralization is not always anarchy.
The definition of Anarchy is chaos, chaos and disorganization. While decentralization has nothing to do with chaos or disorganization.
There is a difference between anarchy and decentralization in a special relationship formed by the world community.
As in the open source world, it is an example of decentralization in technology.