Endomorphism is a term used in mathematics that refers to a function that maps a mathematical object onto itself. The concept of an endomorphism can also be referred to by several other words, such as self-map, autonomous transformation, self-morphism, and endofunction. Each of these terms is used interchangeably to describe the same concept of a function that maps an object onto itself, but they can be used in different contexts or by different mathematicians depending on their preferences. Other synonymous words that are less commonly used in place of endomorphism include monomorphism and isomorphism, which refer to specific types of endomorphisms with additional properties.