is a specific kind of: unit, whole.

is a broader term that covers: cocoon | body, organic structure | body, dead body | asterism | black body, blackbody, full radiator | body | carpet | celestial body, heavenly body | consolidation | constellation | cover, covering, natural covering | estraterrestrial body, extraterrestrial object | mechanism | nest | radiator | rock, stone | sample | tangle | cosmos, creation, existence, macrocosm, universe, world | plant part, plant structure ... show more.

is the opposite of: artefact, artifact.