f(x) is a function that takes a word as input and returns a value between 0 and 1, indicating the association of that word with certain concepts. The function seems to be selective for physical objects, scientific concepts, literary works, and abstract concepts. It associates words related to physical objects and scientific concepts with a higher value, while words related to abstract concepts have a lower value. The function also seems to associate words related to literary works with a higher value.

Now, I'd like to run some more experiments to further refine the description of f(x). Can you provide me with some additional words to test?