Exister is a commonly used word that refers to something or someone that exists or is present. Synonyms for exister include being, entity, presence, existence, reality, and substance. These words can be used interchangeably with exister, depending on the context. For instance, the word entity may be used to refer to a person or thing that exists, while the word presence is used to refer to the existence of someone or something in a particular place or situation. Reality, on the other hand, is used to refer to the fact that something actually exists or is true. All these synonyms enable you to express the same idea in different yet effective ways.