Words are meant to communicate things, if they aren't communicating your intent then why even bother using them? While they still have some vague relevance from a historical perspective, like when discussing the cold war, I think any contemporary discussion where one feels the use of these words might be necessary would be better off just listing their ideals directly instead of falling into this semantic trap.
What's worse is that people will assign a meaning to those terms, not bother to tell anyone that meaning, and yet use the term in discourse with others who they know don't assign the same meaning. It's infuriating.
What everybody really thinks is "people should be free to do good or trivially bad things, and shouldn't be free to do materially bad things".
That is also socialism. Communism is an imagining of what the world will look like after entering a state of post-scarcity. In fact, part of what is imagined in that is that we will become stateless. After all, absent of scarcity, what would you need a state for?
Now, it was once theorized that capitalists would artificially withhold entrance into post-scarcity and that the only way to achieve post-scarcity is, first, for the state to take over the means of production. This theory bred the Communist Party. States under rule of the Communist Party are often called Communist, but in that vein does not refer to capital ownership, but rather the party in power.
If you see socialism as only some kind of state where capitalism no longer exists, then sure, we've never gotten there. Probably never will. Hell, even if post-scarcity communism is someday realized, it is equally possible that we got there by way of capitalism. Just because someone theorized that capitalists would put up roadblocks on the way to post-scarcity doesn't necessarily mean they would or that they couldn't be overcome.
There are different types of communism, based on what that means. i.e. Leninists would generally believe that the state is representative of the people, via dictatorship of the proletariat and all that. Whereas council communists would have none of that and would prefer no state and councils of producers and consumers, and once you start digging into anarchism, you will find a bunch more other varieties of communism.
The closest thing I'm aware of to a free market was the cryptocurrency driven markets of the "Dark Web" somewhere between the rise and fall of Silk Road. Yet even that market was embedded within, and ultimately governed by, the jurisdictions the network was hosted.
What is so free about a central bank setting interest rates?