Is holding a concrete noun

Answer 1

The noun (gerund) 'holding' is a concrete noun as a word for an area of land held by lease; the stocks, property, or other financial assets held by someone; the collections owned by a library or museum; a word for a physical thing.

The noun 'holding' is an abstract noun as a word for the conditions under which land or buildings are held or occupied; the process of organizing something such as an election or meeting; in a sport, the illegal use of the arms, hands, body, or stick to obstruct the movements of an opponent; a word for a concept.