Existentialist philosophy is a term heavily associated with the works of Jean-Paul Sartre and Albert Camus. Its core belief is that human existence is fraught with a sense of isolation and despair due to the absurdity of life. However, there are several synonyms for the term, each exploring different aspects of the same philosophy. One such synonym is Phenomenology, which refers to the study of human consciousness and experience. Another synonym is Ontology, which delves into the nature of being and existence. Finally, the term Absurdism explores the idea that human beings live in a meaningless and irrational universe, but it is still necessary to find purpose and meaning in life.