Excerpt from Wikipedia:

As one of the many [types of socialism](https://en.m.wikipedia.org/wiki/Types_of_socialism "Types of socialism"), communism became the dominant political tendency, along with [social democracy](https://en.m.wikipedia.org/wiki/Social_democracy "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](https://en.prolewiki.org/wiki/Scientific_socialism "Scientific socialism") alongside [Friedrich Engels](https://en.prolewiki.org/wiki/Friedrich_Engels "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](https://en.prolewiki.org/wiki/Class_struggle "Class struggle"). Marx, however, used the terms [socialism](https://en.prolewiki.org/wiki/Socialism "Socialism") and communism interchangeably and he drew no distinction between the two. [Lenin](https://en.prolewiki.org/wiki/Vladimir_Lenin "Vladimir 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.