Terms have meanings indeed, but sometimes those meanings are stupid, made up, and deliberately chosen to mist the waters for whatever the actual agenda is. But seeing how some adults believe in Santa Claus or s first earth, maybe ancaps are just delusional.

Regardless, much smarter people than I have made arguments as to why "anarcho capitalism" is a misnomer. There's a while list on Wikipedia: https://en.wikipedia.org/wiki/Anarcho-capitalism#Analysis_and_criticism