The term 'Atmosphere Makeup' refers to the components that make up the atmosphere of a planet or other celestial body. The three main components are GAS (3 letters), GASES (5 letters) and AIR (3 letters). GAS stands for 'gases', which are made up of molecules of different elements and compounds. GASES is an acronym for 'gaseous elements', which are the most abundant components of the atmosphere. Finally, AIR stands for 'AIR', which is composed of nitrogen, oxygen, and other gases. Together, these three components form the atmosphere of a planet or other celestial body.