Based on the output of the function for the given words, here is a description of the function implemented by f(x):

[DESCRIPTION]: The function seems to be selective for the concept of "school". It assigns a higher value (closer to 1) to the word "school" compared to other words tested. However, it also shows some degree of selectivity for the concepts related to "Nazis", with a relatively high value assigned to the word "Nazis". Additionally, the function assigns relatively low values to words like "roots", "Buddha", "tsunami", "helmet", "hip-hop", "shows", and "serif".

Please note that this description is based on the limited set of words provided and may not fully capture the behavior of the function. It is recommended to further test the function with a diverse range of words to gain a more comprehensive understanding.