Anarcho-communism is antithetical to authoritarianism. But the use of the word today is nearly synonymous with Lenin’s or Bolshevik’s communism (and their further variations by multiple future parties, like Mao-communism), because this was the only flavor that actually existed as ideology in countries where communist parties were/are in power.

You my run with your own definition of communism being of a particular flavor, but you will always face people that do not understand you, because the common definition is not that.