What is an example of the same word being used as a noun and adjective?

Here are a few examples of the same word being used as both a noun and an adjective:

* Summer:

* Noun: "We went to the beach during the summer."

* Adjective: "We had summer weather in October."

* Gold:

* Noun: "The gold was hidden in a secret compartment."

* Adjective: "She wore a gold necklace."

* Blue:

* Noun: "The sky was a beautiful blue."

* Adjective: "She had blue eyes."

* Iron:

* Noun: "The blacksmith used a piece of iron to make the horseshoe."

* Adjective: "The fence was made of iron bars."

* Park:

* Noun: "We went for a walk in the park."

* Adjective: "He drove his car to the park entrance."