Covalent and macromolecular are not the same. Covalent refers to a type of chemical bond in which two or more atoms share one or more pairs of electrons. Macromolecule refers to a large molecule, such as a protein or nucleic acid, that is composed of many smaller repeating units called monomers.

All macromolecules are held together by covalent bonds, but not all covalent bonds are macromolecules. For example, the molecule carbon dioxide is held together by a covalent bond, but it is not a macromolecule because it is not composed of many repeating units.