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Sometimes a noun can describe another noun (ex. mountain bike), usually adjectives are used to describe a noun. But there is also a possibility to create an adjective from the noun.
What makes that sometimes it is valid to use a noun instead of adjective (even this which was derived from the noun) ? Why we say for example "golden bridge" instead of "gold bidge", what is the difference ?
It is called compound nouns (which is a compound noun itself), a compound variation that is open. Such a construct consists of one noun and an attributive noun or an adjective. In this case it would be: one noun and an attributive noun (which acts as if it was an adjective). Reference: https://www.thoughtco.com/what-is-attributive-noun-1689012 Did you mean: "Golden Gate Bridge"? In this case, it is a proper noun, based on the name of the bay "Golden Gate". Otherwise, and as mentioned before, "golden bridge" would be a bridge made of gold, partially made of gold or would have an appearance of gold to it. "Gold Bridge" might be a proper noun.
