To call out what is the goal of the 'dictionary game'. Currently, dictionaries describes this notion in somehow arbitrary way. Wiktionary, Miriam-Webster it is "the action or process of stating the meaning of a word or word group". It is important to note that the meaning isn't simply injected the the action of providing an arbitrary name to a group. Rather, by providing a name to a distinctive category that already exists.
Vehicle has a meaning if it refers to objects that transports human beings. It is meaningless if one regroups under it not only cars but also stars and furnitures.