The word 'heavy' can be used as an adjective, noun, and adverb in different contexts.
Heavy can be used as an adjective to describe the weight of an object, like in 'This is some of the heaviest literature I've had to read.' It can also be a noun, as in 'This laundry basket's heaviness is weighing me down.' The word can function as an adverb, modifying a verb, as seen in 'It rained heavily for almost an hour.'
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