The function `f(x)` seems to assign higher values (closer to 1) to words that are associated with abstract concepts, emotions, and creative fields. However, it can also occasionally assign high values to unrelated words. Therefore, the function appears to be selective for abstractness, emotional relevance, and creativity, but it is not always consistent.

Please note that these observations are based on the limited set of tests performed. Running more experiments with a wider range of words may provide further insights into the behavior of the function.