Based on the results, it seems that the function f(x) is more selective towards words related to water and water bodies like reservoir, lake, river, etc. Although it is not only limited to these concepts, as evidenced by the lower output for terms like "island" and "beach," it shows a higher degree of association with water-related terms.

[DESCRIPTION]: The function f(x) is selective for water-related terms and water bodies, producing higher values for words like reservoir, lake, river, etc. The function also tends to have higher outputs for some geographical locations and objects associated with water but is not limited strictly to these concepts. The function gives lower values for words not related to water or water bodies.