In the sentence "I hope you are all paying attention, here is a sentence I made earlier", is here an adverb or a noun? I think it is a noun, but if I substitute a noun or a pronoun for here, the sentence loses its intended meaning.
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John Lawler notes in a comment on a different answer here:
according to dictionary.com, the word 'here' can be a noun as in this example "It's only a short distance from here."