After analyzing the provided outputs from f(x), it appears the function is selective for concepts related to creepy, crawly things, and possibly other specific animals.

[DESCRIPTION]: The function f(x) seems to be mostly selective for words associated with creepy, crawly creatures or concepts (e.g., spiders, octopus). Some other specific animals (e.g., stems - plant-related) and objects (e.g., table) also receive higher scores, but the majority of the high-scoring words seem to relate to the creepy, crawly concept.