Pathfinding is a noun. A noun is a type of word the meaning of which determines reality.

Is path A English word?

noun, plural paths [pathz, pahthz, paths, pahths]. a way beaten, formed, or trodden by the feet of persons or animals. a narrow walk or way: a path through a garden; a bicycle path. a route, course, or track along which something moves: the path of a hurricane.

Is pathfinding A word?

noun. The action of a pathfinder; (literal) the action of finding or marking a path or way; (figurative) pioneering or trailblazing activity.