The noun 'addition' is a common noun.
The noun 'addition' is an uncountable, abstract noun as a word for the process of adding two or more numbers or amounts together to make a total.
The noun 'addition' is a countable, abstract noun as a word for the process of adding or joining something to something else.
The noun 'addition' is a countable, concrete noun as a word for an extension that is added to a building.
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