Communism (from Latin communis 'common, universal')[1][2] is a sociopolitical, philosophical, and economic ideology within the socialist movement,[1] whose goal is the creation of a communist society, a socioeconomic order centered on common ownership of the means of production, distribution, and exchange that allocates products in society based on need.[3][4][5] A communist society entails the absence of private property and social classes,[1] and ultimately money[6] and the state.[7][8][9]

https://en.wikipedia.org/wiki/Communism

Let's see how the USSR performed against this definition of communism.

• Common ownership of the means of production, distribution, and exchange that allocates products in society based on need.
  Kind of, the state owned most means of production and distributed products. Arguably based on Russian need rather than any other Soviet republic's need. Let's be generous and say partial pass for this one.

• Absence of private property and social classes
  Presumably this is private property as in the distinction between personal and private property set out by Proudhon. In that regard, as the state owned most all private property, in a way it was absent. But the state still owned it, and the state is counter to communism. Social classes still remained.

• Ultimately money
  Still existed.

• The state.
  That definitely still existed.

So what part of the USSR was real communism? Kind of common ownership of the means of production and kind of the absence of private property. All other criteria were failed.