The function f(x) takes a word as input and returns a value between 0 and 1 indicating the word's association with the concept of "animals". The function is selective for words related to this concept, but the association is weak for most words. The output value for "word3..." is higher than the others, suggesting a stronger association with the concept.

Please provide more input words for me to test and I can continue to refine the description of the function.