An abstract number is a number with no context of application to real life objects or items.
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The word many, when used as a noun, is an abstract noun, a word for a concept rather than a specific number. The noun many is a plural noun.
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There is no word in English spelled 'choise'. Perhaps you mean the abstract noun 'choice', a singular, common, abstract noun; a word for an act of choosing between two or more possibilities; a number or variety from which to choose; a thing or person which is chosen. The word 'choice' is also an adjective: choice, choicer, choicest.
A written language.
The abstract noun forms of the verb to diversify are diversification and the gerund, diversifying.A related abstract noun is diversity.