Based on the experiments conducted, here is a description of the function implemented by f(x):

[DESCRIPTION]: The function appears to measure the degree of association between the input words and a concept related to abstractness or intangibility. The function assigns a value between 0 and 1, where a value closer to 1 indicates a stronger association with the abstract concept. In the given experiments, the function assigned low values to concrete words like "apple" and "cat," indicating a weaker association with the abstract concept. On the other hand, the function assigned a higher value to the word "cloud," indicating a stronger association with the abstract concept. Overall, the function seems to be selective for an abstract or intangible concept. 

Please let me know if you would like to further explore the behavior of the function or have any additional questions.