A noun is sometimes used to qualify another noun, so in practice it acts as an adjective. In these cases, we have to pict the underarrow (see Section 13. Adjectives), but we cross it out to mean that is not an proper adjective.
These are picted the same way as personal pronouns but with a pointing arrow, as follows:
When the possessive becomes a pronoun (mine, yours, etc) we proceed as follows: