Topic: Interchange of Parts of Speech,

Best Answer Explained in Below-:

The word "wisdom" is classified as a noun because it represents a person, place, thing, or idea. Specifically, "wisdom" refers to the quality of having knowledge, experience, and good judgment. Nouns are essential components of a sentence, serving as the subjects or objects that convey meaning.

In this context, "wisdom" embodies an abstract concept — the ability to make sound decisions based on knowledge and insight. Unlike verbs, which denote actions (e.g., "to run" or "to think"), or adverbs, which modify verbs and describe how actions are performed (e.g., "quickly" or "carefully"), nouns like "wisdom" focus on identifying or naming something.

Additionally, pronouns are words that replace nouns (e.g., "he," "she," "it") and are not applicable here since "wisdom" does not replace or refer to a noun but is itself a noun. Thus, understanding the definition and role of a noun clearly indicates that "wisdom" fits squarely within this grammatical category, making option A the correct choice.