The noun 'challenges' (the plural form of the noun challenge) is an abstract noun; a word for demanding or stimulating situations; calls to engage in a contest or fight; questioning a statement and demanding an explanation; a word for a concept.
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Examples of abstract, concrete noun combinations:Statue of Liberty (statue is a concrete noun; liberty of an abstract noun)science building (science is an abstract noun; building is a concrete noun)bargain basement (bargain is an abstract noun; basement is a concrete noun)the noun 'air' is a concrete noun as a word for the substance that surrounds the earth; the noun 'air' is an abstract noun as a word for the ambiance of a place.the noun 'heart' is a concrete noun as a word for an organ of the body; the noun 'heart' is an abstract noun as a word for the essence of something.the noun 'edge' is a concrete noun as a word for the sharp side of a blade; the noun 'edge' is an abstract noun as a word for an advantage.
The noun 'hopefulness' is an abstract noun, a word for an emotion.
The noun 'question' is an abstract noun, a word for an idea, a word for a concept.
The word 'independence' is an abstract noun, a word for a concept.
The noun 'judge' is a concrete noun, a word for a person.The noun forms of the verb to judge are Judgement and the gerund, judging, abstract nouns as words for concepts.