To be fair the term capitalism was created by socialists as a way to criticize it. Adam Smith and other pre-Marx economists never used the term. It only became a common term after Marx kept saying "capitalist mode of production" and that's just a mouthful.

So the word comes up most often in socialist circles. Liberals don't like calling it capitalism because the very word gives undue authority to capital, which liberals deny. Liberals don't believe capital has supreme power and don't want to describe society like that.