The word "field" is being used for its multiple meanings in this pun. It can refer to both the literal field that the scarecrow is standing in and also to the field as a subject area or expertise in which the scarecrow is outstanding.
The word being used for its multiple meanings in the pun is "field." In this context, "field" refers to both the literal field where a scarecrow would typically be found and the metaphorical field of expertise or occupation.
The word "field" in the pun, "The scarecrow won an award because he was outstanding in his field," is being used for its multiple meanings. In this sentence, "field" can refer to the literal meaning of a piece of land used for growing crops. However, it is also used figuratively to mean an area of expertise or a specific domain of activity in which someone excels or is outstanding. So, "field" is the word being used for its multiple meanings in this pun.
