Which of the following is an example of a homonym?

A homonym refers to two or more words that sound the same but differ in meaning and may also differ in spelling. All the examples provided fit this definition.

The pair "wind and wind" illustrates how the same spelling can represent different meanings; one refers to the movement of air, while the other means to twist or coil.

The words "read and read" also serve as an excellent example, with one pronunciation specifying the present tense and the other indicating the past tense.

Similarly, "bat and bat" demonstrates the concept well. One meaning refers to a flying mammal, while the other refers to a piece of sporting equipment used in games like baseball.

Since each example showcases homonyms that share pronunciation yet convey different meanings, it's accurate to conclude that all provided options are indeed homonyms.