What's the difference between an adjective phrase and a noun phrase For example economic development economy development Is there a difference between the two words?

There is little difference between the two phrases
The former is "economic + development", which is easy to understand and has nothing to say
The latter is that two nouns are put together in succession. When the two nouns are connected together, the function of the former noun will automatically turn into its corresponding adjective as an attributive

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