The term 'Nature Author' can be summarized by the crossword solution of Emerson, which is a 7 letter word. Ralph Waldo Emerson was an American essayist, lecturer, and poet who lived in the 19th century. He is best known for his essays on nature and transcendentalism, which is a philosophical movement that emphasizes the spiritual and divine aspects of nature. Emerson's works have had a lasting impact on American literature and culture.