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The word 'harmful' is not a noun.

The word 'harmful' is an adjective, a word used to describe a noun.

The noun form of the adjective 'harmful' is harmfulness.

The word 'harmful' is the adjective form of the noun harm.

The nouns 'harmfulness' and 'harm' are both common, uncountable (mass), abstract nouns; words for concepts.

The word 'harm' is also a verb: harm, harms, harming, harmed.

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8y ago

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