a word derived from a noun and expressing possession of a thing
Write ten sentences, each containing a possessive noun modified; an appositive modified; an adverbial phrase modified.
Whose efficiency is explained by the possessive noun, man's.
A possessive noun or pronoun modifies the substantive to which it is attached as an adjective might do.
They are more like the possessive noun, which belongs to another word, but is still a noun.