Question

what is abstract noun for need and knowledge

Answer 1

Knowledge is already in its abstract noun. Its noun is Know.
Hope it helps you!!

Answer 2

$\underline{\underline{\Huge\mathfrak{Answer ;}}}$

Dear ,

Abstract Noun is a noun, for example ‘goodness’ or ‘freedom’, that refers to an idea or a general quality, not to a physical object.

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@dmohit432