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Atoms are the tiniest or smallest constituent of all living and non living matter. They are indivisible according to dalton.
when two or more atoms combine a molecule is formed. A molecule can be further broken down into atoms, an atom is made up of protons, electrons and neutrons while a molecule is made up of atoms. In a molecule if the atoms are same, it is homoatomic if not it is heteroatomic.

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Atoms are the smallest particle  of a substance.
and molecules are formed when two atoms join with other  similiar or different atoms.
And let me tell u one thing more of molecules and that is the smallest unit of a compound is a molecule.
Hope this helps u !!!