For example within nouns there are two sub classes, concrete nouns and abstract nouns.

The concrete nouns include people, plants, animals, materials and objects while the abstract nouns refer to concepts such as qualities, actions, and processes.

Elin K. Jacob found that classification and categorization are different processes

Categorization is, for example, mostly used by cognitive psychologists for what other call classification

Categorization is sometimes considered synonymous with classification

Categorization is grounded in the features that distinguish the category's members from nonmembers.

Categorization is the human ability and activity of recognizing shared features or similarities between the elements of the experience of the world (such as objects, events, or ideas), organizing and classifying experience by associating them to a more abstract group (that is, a category, class, or type),[1][2] on the basis of their traits, features, similarities or other criteria.

According to the historian Robert Darnton, this led to a very particular structuring of knowledge: commonplace users "broke texts into fragments and assembled them into new patterns by transcribing them in different sections of their notebook." It was a mixture of fragmented order and disorder that anticipated a particular form of scientific investigation and organisation of information.

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Organ transplantation in fiction