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When do you say: "noun's noun", "noun of noun", "noun + noun" and "adjective + noun"?

For example there's an album called "demon days" by Gorillaz. I think demonic is right, because demonic(adj) describes the noun. Or maybe 'these are the days of the demon'?

closed as too broad by Cascabel, Edwin Ashworth, David, choster, Phil Sweet Jul 14 '17 at 0:40

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Fish tank is an example of a compound noun.

Sometimes compound nouns use the closed form, e.g. baseball, earphones.

Demon Days is an example of an open form.

Hyphens are also common, e.g. fire-fighter.

You can make compounds in all word classes, not just nouns. See the provided link.

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