Based on the output values of the function for the given inputs, it seems like the function is selective for concepts related to natural elements such as the moon, sun, fire, rain, and spider. These inputs have relatively higher output values compared to other inputs. However, it is worth mentioning that the function also seems to be sensitive to input words unrelated to natural elements, as indicated by the lower output values for words like apple, car, love, chair, peace, and cat. 

Therefore, a possible description of the function implemented by f(x) could be:

[DESCRIPTION]: The function seems to be selective for concepts related to natural elements, such as the moon, sun, fire, rain, and spider. It assigns higher values closer to 1 for inputs that are associated with these natural elements. However, it also exhibits sensitivity to unrelated inputs, assigning lower values for them.