noun
A word that represents a person, place, thing, or idea. In this case, 'room' is a noun.
adjective
A word that describes or modifies a noun. In this case, 'smart' is an adjective describing the type of room.
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The hotel boasted state-of-the-art smart rooms equipped with the latest technology.
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I love staying in smart rooms because everything is automated and convenient.
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Dude, have you seen the new smart room at Jake's place? It's so cool!
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Her mind was like a smart room, organized and efficient in processing information.