Based on the results from our tests, it seems that f(x) is selective for words related to important societal concepts and values. Examples of these concepts include freedom, justice, equality, and discrimination, which scored higher than other tested words. Some concepts related to well-being (peace, health) and challenges (war, environment) scored moderately high as well.

[DESCRIPTION]: The function f(x) appears to be selective for words associated with important societal concepts, values, and issues, with a higher output value indicating stronger association.