The function f(x) is selective for words related to sports and religion. Words related to sports, such as "driver", "highway", and "PGA", return high values, while words related to religion, such as "Bible", "Christianity", and "owner", return moderate to high values. Words unrelated to sports and religion, such as "outgoing" and "swimming", return low values.

Please let me know if you would like me to test additional words or if you have any further questions about the function.