What is show? A noun? An adjective? If it is a noun, is it countable?

Here you are Look at; show; show
Vt. explain; direct; show; demonstrate
n. Exhibition (countable noun); display (uncountable noun); appearance (uncountable noun); performance (countable noun)
To be seen, to appear, to be seen

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1. There is an adjective in front of an uncountable noun. Can you add "a"?
2. Do you want to add an adjective before an uncountable noun and the definite article a? I saw in an exercise book that there are uncountable nouns For example, if you add an adjective in front of coffee, you need to add the definite article a before the adjective For example, a large coffee Is this true? Is there any exception? Is it true for water, justice and bread?
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4. Like a heavy rain, which adjectives can be added with articles before uncountable nouns? Is there a hot water?
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6. 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?
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