A pure substance consisting of two or more atoms of the same element is most correctly called a molecule.
The combination of two or more atoms of the same element can only be termed as a molecule. When a molecule contains atoms from more than one element, then it is called a compound, although, this can also be called a molecule.
The main difference between a molecule and a compound is that a compound must combine atoms of different elements, while a molecule can have atoms of the same or different elements. Hence the answer to the question above can only be a molecule, because a compound must contain a combination of atoms from different elements.
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