An incubator is a device used to maintain a controlled environment for hatching eggs or for the development of premature infants. However, there are various synonyms used for this word, such as a brooder, hatchery, nursery, hotbed, or even a greenhouse. A brooder is used for rearing chicks or young livestock, whereas a hatchery is a facility that incubates eggs for commercial use. A nursery is a term used for a hospital unit that provides specialized care to newborn babies. A hotbed is a term used to describe a place where growth and development are accelerated. A greenhouse is a building used for growing plants in a controlled environment, similar to an incubator for eggs.