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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

whole, unit go
an assemblage of parts that is regarded as a single entity

natural object go
an object occurring naturally

mechanism go
a natural object resembling a machine in structure or function

barrier
anything serving to maintain separation by obstructing vision or access

noun.object

3 Subcategories

bar go
a submerged (or partly submerged) ridge in a river or along a shore
blood-brain barrier go
a mechanism that creates a barrier between brain tissues and circulating blood
curtain go
any barrier to communication or vision