“Capitalism” is a Marxist term.
What characterizes the Western Free Market is not just the right to buy and sell, but also the role of government in protecting private property, and not allowing arbitrary seizures by the powerful.
I will argue that you speak of commerce.
Capitalism is more about the acquisition of assets that can be relied on to produce a return on invested capital.
It is those assets, be they hard assets like real estate, or precious metals, or corporate shares or even fine art that are the deployment of capital that produces a return.
Those assets produce commerce.