The word denomination refers to a class or category. Its antonyms are words that denote a lack of classification or categorization. These words include non-classification, non-categorization, non-label, non-system, and non-type. Another antonym for denomination could be "unidentified" or "unspecified." It means that there is no specific classification or label for a particular thing. The antonyms of denomination could be used to express a lack of organization or a lack of specificity in various contexts. For example, the antonyms of denomination could be used in scientific research to describe a phenomenon that has not yet been classified, or in a business context to refer to an unorganized system.