The function f(x) tends to associate words that have a specific characteristic or property with a high value close to 1. It is also selective for certain concepts. 

- Words like "script" and "serif" have a high association value close to 1, indicating that the function is selective for words related to programming or typography.
- Words like "knights" and "tombstone" have moderate association values, suggesting an association with concepts related to history or medieval themes.
- Words like "83%" and "rhythm" have moderate association values as well, implying an association with numerical or rhythmic concepts.
- Words like "planes" and "excavation" have low association values, indicating a weak association with any specific concept.

It is worth noting that this description is based on the given words and their corresponding outputs. Further experiments with a larger set of diverse words can help refine the description and uncover additional concepts that the function may be selective for.