The crossword solution for the term BIGHTS, E.G. is BAYS, which is a four-letter word. BAYS is an acronym for Bodies of water, Air, Yeasts, and Soils. This acronym is used to refer to the four main components of the environment. Bodies of water include rivers, lakes, and oceans. Air refers to the atmosphere, which is composed of gases such as oxygen and nitrogen. Yeasts are single-celled fungi that are used in the production of beer, wine, and bread. Soils are the top layer of the Earth's surface, which is composed of organic matter, minerals, and other materials.