Atmospheric Boundary Layer (ABL) is a term used in meteorology that refers to the layer of the atmosphere adjacent to the surface of the Earth. There are various synonyms for the Atmospheric Boundary Layer which includes Planetary Boundary Layer (PBL), Planetary Surface Layer (PSL), and Convective Boundary Layer (CBL). The PBL refers to the layer where the turbulent mixing process is influenced by the earth's rotation. The PSL on the other hand implies the lowest part of the atmosphere in contact with the surface of the earth and is affected by diurnal thermal processes. The CBL refers to a type of boundary layer formed due to convective processes. Overall, these synonyms describe different aspects of the same atmospheric layer depending on the specific conditions and characteristics.