What is the Feminine Gender of a Kook? (Kook Opposite Gender)

The word for a strange or eccentric person is the same for men and women. Fill each blank with the word: kook.

1. He was known as the neighborhood _______ because he wore a tin foil hat.
2. They thought she was a _______ for talking to her plants.
3. Don't be a _______, that's a silly idea!
4. The newspaper called the inventor a _______, but his invention worked.