Heteroatom refers to an atom in a molecule that is not carbon or hydrogen. Some common heteroatoms include nitrogen, oxygen, sulphur, and phosphorous. There are several synonyms for heteroatom, including non-carbon atom, hetero element, heterogen, heterovalent element, and alien atom. These terms are often used in chemistry and biochemistry to describe the properties of a particular molecule. By understanding the different synonyms for heteroatom, scientists can communicate more clearly and precisely about the structures and functions of various chemicals. Whether studying organic chemistry, biochemistry, or molecular biology, the use of accurate and appropriate terminology is essential.