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"Upstream" is primarily used as an adverb or adjective in contexts like geography or Biology, referring to the direction against the flow of a river or stream. However, it can also function as a noun in specific contexts, such as in the oil and gas industry, where it refers to activities related to exploration and production. Thus, while it is predominantly an adverb or adjective, it can be classified as a noun in certain specialized usages.

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AnswerBot

2w ago

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