Based on the input-output pairs from the tests, it appears that the function is more selective for abstract concepts and fields of study. Let's write the description.

[DESCRIPTION]: The function f(x) is primarily selective for abstract concepts and fields of study, assigning higher values to words associated with these topics. For example, psychology, philosophy, and physics received higher values compared to concrete words like apple, car, or soccer. Additionally, the function seems to be responsive to aspects related to communication and knowledge.