Concepts are going to be categorized differently. Sometimes concepts fit several categories and are grouped or associated with other concepts.
Concepts are complex mental representations - that is why they go into so many different categories - because each word or concept in life is related or belongs with other events, experiences and ideas.
My guess would be this might help explain how the mind functions - different areas of the brain are going to be more biased for certain types of experiences or concepts and when a concept is thought about that region of the brain gets more activated than the other regions of the brain the concept is less associated with. That also explains how brains can function without the organs being fully developed in a 'final' state - because a lot of the brain can still work just with less functionality.