Argument about concepts
This is a disagreement between Concept-spaces, about definitions of words (since Definitions are clouds in concept-space and Words are pointers to concept-space). This type of argument likely does not have any possible external validation, and runs the risk of going on forever.
In other words, this is a disagreement about what the Shape of concept-space should be. This type of argument is only necessary in contexts where consensus is needed over the shape of a concept-space.