Existentialist fiction is a popular literary genre that explores the concepts of existence, individuality, and human freedom. It is a thought-provoking genre that forces readers to question the nature of their existence and their place in the world. Some synonyms for existentialist fiction include philosophical literature, introspective writing, and ontological fiction. Other synonyms include absurdist literature, which focuses on the irrationality of existence and the meaninglessness of life. Existentialist fiction is also closely related to postmodern literature, which questions traditional narratives and challenges established perceptions of reality. Ultimately, the genre is a fascinating and complex realm for writers and readers alike.