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The word 'additional' is not a noun; additional is an adjective, a word that describes a noun (a countable or uncountable noun).

The noun form is addition; a countable noun as a word for something that you add to something else (an addition to a product line, an addition to a building); an uncountablenoun as a word for the act of adding something to something else (addition is the first step in learning math).

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12y ago

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