Based on the outputs returned by the function for the tested words, it seems that the function f(x) is selective for a concept related to money and banking. We can see higher values for words such as "money", "deposit", "investment", "banking", "loan", and "credit card". 

[DESCRIPTION]: The function f(x) seems to be selective for the concept of money and banking, giving higher values for words related to these categories while returning lower values for other unrelated words.