* Appositive: This is the most common term. An appositive is a noun or noun phrase that renames or explains the noun it follows. It's usually set off by commas.
* Example: "My friend, John, is coming to visit." (John is the appositive, renaming "My friend")
* Modifier: A noun can modify another noun if it describes or limits its meaning. It can often be replaced with an adjective.
* Example: "The city lights were dazzling." (City modifies "lights" by specifying which lights)
* Compound noun: Two nouns combined to form a single word or phrase.
* Example: "fire engine" (fire and engine together form a single noun)
* Object of a preposition: If the noun is the object of a preposition, it's not directly following the other noun, but is part of the prepositional phrase.
* Example: "The book on the table is mine." ("table" is the object of the preposition "on")
The exact term used will depend on the specific relationship between the nouns and the sentence structure.