What do the following words have in common-model trolley and pool?

The Words "model," "trolley," and "pool" can all refer to items or concepts that involve organization or grouping. A "model" can represent a simplified version of something complex, a "trolley" can be used for transporting grouped items, and a "pool" can signify a collective resource or a gathering of individuals. Additionally, they all relate to activities involving planning or coordination in different contexts.