"A chemical compound is a chemical substance of two or more different chemically bonded chemical elements, with a fixed ratio determining the composition.." - Wikipedia

"In chemistry, a molecule is defined as a sufficiently stable electrically neutral group of at least two atoms in a definite arrangement held together by strong chemical bonds." - Wikipedia

A molecule is a compound, but a compound is not necessarily a molecule. Typically, in chemistry, molecules are held together by covalent bonds, whereas compounds are held together by ionic bonds.