Based on the outputs of the function for the given words, let's try to observe patterns and characteristics to describe what the function might be doing.

1. "mourning" - Output: 0.0020
   The function assigns a very low value to the word "mourning". This suggests that the concept for which the function is selective might have low association with mourning.

2. "rocket" - Output: 0.0112
   The function assigns a relatively low value to the word "rocket". This indicates that the concept might have moderate association with rockets.

3. "Zeus" - Output: 0.0143
   The function assigns a slightly higher value to the word "Zeus" compared to "rocket". This suggests that the concept might have a slightly stronger association with Zeus.

4. "innocent" - Output: 0.0054
   The function assigns a low value to the word "innocent". This implies that the concept might not have strong association with innocence.

5. "seconds" - Output: 0.0311
   The function assigns a higher value to the word "seconds" compared to the previous inputs. This suggests that the concept might have a relatively stronger association with seconds in some way.

6. "Minecraft" - Output: 0.6478
   The function assigns a very high value to the word "Minecraft". This indicates that the concept for which the function is selective might have a strong association with Minecraft.

7. "outgoing" - Output: 0.0103
   The function assigns a relatively low value to the word "outgoing". This suggests that the concept might have moderate association with being outgoing.

8. "snowboarding" - Output: 0.9956
   The function assigns a very high value to the word "snowboarding". This implies that the concept for which the function is selective might have a very strong association with snowboarding.

9. "NFL" - Output: 0.0145
   The function assigns a slightly higher value to the acronym "NFL" compared to "rocket" and "Zeus". This suggests that the concept might have a slightly stronger association with the NFL.

10. "American Revolution" - Output: 0.0017
    The function assigns a very low value to the phrase "American Revolution". This implies that the concept might not have strong association with the American Revolution.

From these observations, we can make a preliminary description of f(x):
[DESCRIPTION]: The function f(x) assigns values between 0 and 1 to words based on their association with different concepts. It seems to have low association with mourning, moderate association with rockets, a slightly stronger association with Zeus, low association with innocence, relatively stronger association with seconds, a strong association with Minecraft, moderate association with being outgoing, a very strong association with snowboarding, a slightly stronger association with the NFL, and low association with the American Revolution.

Let's continue testing with more inputs to further refine our description.

Please provide more words for testing.