principal [principals]◼◼◼(chief administrator of a school) noun [UK: ˈprɪn.səp.l̩] [US: ˈprɪn.səp.l̩]He must be the principal. = Il doit être le principal.
headmaster [headmasters]◼◻◻(the most senior master in a school (male)) noun [UK: hed.ˈmɑː.stə(r)] [US: ˈhed.ˈmæ.stər]