No, coincide is not a noun.
The word 'coincide' is a verb (coincide, coincides, coinciding, coincided), a word meaning to occupy the same place in space or time; to occupy the same positions on a scale; to correspond; to agree.
The noun forms for the verb to coincide are coincidenceand the gerund, coinciding.
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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.
Yes, the noun 'question' is an abstract noun, a word for a concept (an idea noun).
The noun friend (friends) is a concrete nounfor a physical person (people).The noun friendship is an abstract noun, a word for a concept.