In the following sentence identify the appositive or appositive phrase and the noun or pronoun defined by the appositive.

Mr. Murray, the Scoutmaster, likes to hike.
Appositive?
Noun or pronoun defined?

Appositive: the scoutmaster

Noun defined: Mr. Murray

The appositive in the sentence is "the Scoutmaster." It renames and provides additional information about Mr. Murray. The noun defined by the appositive is "Mr. Murray." It is the person being referred to in the sentence.

To identify the appositive and the noun or pronoun defined by it, you need to identify a word or phrase that renames or adds information about another noun/pronoun in the sentence. In this case, "the Scoutmaster" renames Mr. Murray, so it is the appositive, while Mr. Murray is the noun defined by the appositive.