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"Above" can be used as a preposition and an adverb, I have learned. But some people use "above" as a noun. They write "All of the above are correct.","The above explaination is good", etc. I suspect that it can be used as a noun.
Are they correct in English usage?
"Above" can be used as a preposition and an adverb, I have learned. But some people use "above" as a noun. They write "All of the above are correct.","The above explaination is good", etc. I suspect that it can be used as a noun.
Are they correct in English usage?
Yes, they are correct. In your second sentence, 'above' is an adjective though.
The usage of "above" 
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