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In English, 'well' primarily functions as an adverb, contrasting with 'good' (adjective). It describes how an action is performed ('He plays the piano well') or indicates a satisfactory state of health or condition ('I feel well today'). As an interjection, 'well' often serves as a filler word or a way to introduce a statement, sometimes implying hesitation or consideration ('Well, what do you think?'). While 'well' can sometimes be used colloquially as an adjective (e.g., 'I am well, thank you'), its primary role is adverbial, differentiating it from 'good'.