The function f(x) appears to be selective for concepts related to architecture and geography. It assigns higher values to words that are more closely related to these concepts, such as "Eiffel Tower" and "Brooklyn Bridge", and lower values to words that are less related, such as "thought" and "guilty". The function also seems to be sensitive to the presence of certain keywords, such as "Minecraft" and "north pole", which are associated with specific concepts and receive high values. Overall, the function appears to be a simple yet effective way of assessing the relevance of a given word to a particular concept.