Is \[C{O_2}\] a compound or molecule?

Hint :Molecule is a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction. A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.

Complete Step By Step Answer:
\[C{O_2}\] is a molecule as well as compound. More specifically, \[C{O_2}\] is considered to be a molecular compound. A molecular compound is a compound that consists of atoms of two different elements (in this case, atoms of carbon and oxygen).
Molecular compounds are very different from ionic compounds like sodium chloride. Ionic compounds are formed when metal atoms lose one or more of their electrons to nonmetal atoms. The resulting cations and anions are electrostatically attracted to each other. On the other hand, in molecular compounds, rather than forming ions, the atoms of a molecule share their valence electrons in such a way that a bond forms between pairs of atoms. In a carbon dioxide molecule, there are two of these bonds, each occurring between the carbon atom and one of the two oxygen atoms.
Water is also a molecular compound. The different atoms in water are hydrogen and oxygen.

Note :
A chemical formula specifies the number of atoms of each element in a compound molecule, using the standard abbreviations for the chemical elements and numerical subscripts. There are four types of compounds, depending on how the constituent atoms are held together:
Molecules – held together by covalent bonds
Ionic compounds – held together by ionic bonds
Intermetallic compounds – held together by metallic bonds
Certain complexes – held together by coordinate covalent bonds.