Can some words that are usually nouns can function as adjectives?

Absolutely! Many words that are usually nouns can function as adjectives. This is called noun modification or attributive use of nouns.

Here are some examples:

* Noun: Time

* Adjective: Time management (the management of time)

* Noun: Water

* Adjective: Water bottle (a bottle for water)

* Noun: Gold

* Adjective: Gold medal (a medal made of gold)

* Noun: Street

* Adjective: Street vendor (a vendor on the street)

How to recognize noun modification:

* The noun acting as an adjective usually comes before the noun it modifies.

* It often describes the material, purpose, or type of the noun it modifies.

Let me know if you'd like more examples or want to explore specific types of noun modification!