Is impossible an abstract noun

Answer 1

No, the word 'impossible' is an adjective, a word used to describe a noun.

The noun form of the adjective 'impossible' is impossibility, an abstract noun as a word for a concept.

Answer 2

Yes, the noun 'impossibility' is an abstract noun; a word for the quality or state of having no potential to be or to be done; a word for something that has no potential to be or to be done; a word for a concept.