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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
a natural object resembling a machine in structure or function

noun.object

3 Subcategories

barrier go
anything serving to maintain separation by obstructing vision or access
transmission mechanism go
any mechanism whereby an infectious agent is spread from a reservoir to a human being
biological clock go
an innate mechanism in living organisms that controls the periodicity of many physiological functions