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physical object > natural object > celestial body > nebula > dark nebula > Coalsack
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Coalsack comparison table
Subject has definition has distance is a kind of is an instance of
dark nebulaA relatively dense cloud of interstellar matter whose dust particles obscure the light from stars beyond it and give the cloud the appearance of a region devoid of stars. nebula 
CoalsackA prominent dark nebula readily visible to the naked eye, located on the galactic plane.170 pc dark nebula

Next dark nebulaHorsehead Nebula    Updark nebula    Previous dark nebulaBok globule