Yeah, it would be silly to try to create a strict system of binaries to describe something as complex as human beings and the constantly changing world we inhabit.
The wick is just the end of the rolling paper, you twist it up so it burns more evenly. The filter is called a crutch and it's just a piece of scrap cardboard to give you something to hold on to do so you don't burn your fingers and lips
Also there is charcoal filters specifically advertised for rolling joints since at least a decade. A brand populat in Germany is linked. Another populat one is called actitubes and Rolling paper companies like Gizeh also make these now.