Nouns. Tip #5: Appositive Nouns and Nouns as Modifiers
An appositive noun is a noun which immediately follows another noun in order to further define or identify it.
Example: My brother, Michael, is six years old.
Michael is an appositive here, further identifying the subject of the sentence, my brother.
Sometimes, nouns can be used adjectivally as well.
Example: He is a speed demon.
Speed is a normally a noun, but here it is acting as an adjective to modify demon.
