Toynbee is a proper noun that refers to Arnold Toynbee, a British historian known for his detailed analysis of civilization. However, since Toynbee is a proper noun, there aren't any synonyms for it. Instead, there are synonyms for the word 'historian' which include scholar, chronicler, analyst, researcher, and chronicler. Another synonym would be 'civilization expert' that describes someone who studies the development and characteristics of human societies. 'Civilization researcher', 'historical philosopher', or 'culture analyst' can also be used as synonyms for Toynbee since he was known for his detailed analysis and insights into the development of civilizations.