No, the word 'challenge' is an abstract noun, a word for something that is hard to do or achieve; a word for an objection to something as not being true, genuine, or proper; a word for an invitation to compete; a word for a concept.
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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.
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.
A graduate is a person, a concrete noun.
Yes, the noun 'boy' is a concrete noun, a word for a physical person.
Patience is an abstract noun, not a concrete noun, because it is a feeling