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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

thing go
a separate and self-contained entity

unit, building block
a single undivided natural thing occurring in the composition of something else

noun.object

5 Subcategories

chain, chemical chain go
(chemistry) a series of linked atoms (generally in an organic molecule)
couple go
(physics) something joined by two equal and opposite forces that act along parallel lines
unit cell go
the smallest group of atoms or molecules whose repetition at regular intervals in three dimensions produces the lattices of a crystal
group, radical, chemical group go
(chemistry) two or more atoms bound together as a single unit and forming part of a molecule
molecule go
(physics and chemistry) the simplest structural unit of an element or compound