“Hierarchy” is less vague and is indicative of an opposition to the state of it is assumed that it is referring to specifically violent hierarchy- or hierarchy that is enforced primarily through violence.

I have my own, more concretely defined definition of Anarchism, but it is true that most anarchists don’t adhere to it. I think that attention needs to be put into solidifying and realizing a concretely defined Anarchism, a process which would be much more effective at “converting” self-described anarchists into a proletarian movement than insisting that they agree with us because we are correct.