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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

object, physical object go
a tangible and visible entity

formation, geological formation go
(geology) the geological features of the earth

crater, volcanic crater
a bowl-shaped geological formation at the top of a volcano

noun.object

2 Subcategories

caldera go
a large crater caused by the violent explosion of a volcano that collapses into a depression
maar go
a flat-bottomed volcanic crater that was formed by an explosion