noun
a noun is a word that represents a person, place, thing, or idea. In this case, 'earth' is a noun that refers to the planet we live on.
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Scientists warn of the potential consequences of a hothouse earth scenario.
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Hey, have you heard about this whole hothouse earth thing?
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The planet could turn into a real hothouse earth if we don't take action.
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Her anger was like a hothouse earth, steadily building up until it exploded.