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Excerpt from Wikipedia:

As one of the many types of socialism, communism became the dominant political tendency, along with social democracy, within the international socialist movement by the early 1920s.[34]

Excerpt from ProleWiki:

Its modern usage is almost always traced back to Karl Marx's usage of the term where he introduced the concept of scientific socialism alongside Friedrich Engels. The theory of scientific socialism described communism not as an idealistic, perfect society but rather as a stage of development taking place after a long, political process of class struggle. Marx, however, used the terms socialism and communism interchangeably and he drew no distinction between the two. Lenin was the first person to give distinct meanings to the terms socialism and communism. The socialism/communism of Marx was now known simply as communism, and Marx's "transitional phase" was to be known as socialism.

I knew about this. I just do not really think anyone claiming superiority based on "define socialism and communism" as someone to be taken seriously, given that terminology is dependant on context and definitions on a base level are arbitrary if taking an axiomatic approach to theory.