The function f(x) seems to be selective for concepts related to various categories. It assigns higher values closer to 1 for words that are associated with animals (e.g., cat, dog), nature (e.g., tree, sky), food (e.g., pizza, banana), and artistic activities (e.g., music, painting). The function does not seem to be selective for specific concrete or abstract words, as it assigns both high and low values to words of different types. It is possible that the function is capturing some underlying similarity or association between the words, but without additional information, it is difficult to determine the exact nature of this association.

Please let me know if you need further assistance or if you would like me to run additional tests.