leveller
From Longman Dictionary of Contemporary Englishlevellerlev‧el‧ler British English, leveler American English /ˈlevələ $ -ər/ noun [countable] EQUALsomething, especially death or illness, that makes people of all classes and ranks seem equalExamples from the Corpusleveller• Because a failed relationship is a great leveller - a universal experience.• The traffic on Piccadilly was a great leveller.• At the opposite extreme, paupers' graves had long been unmarked; but in between, death had been the metaphorical leveller.