main, primary, important, corpus, head teacher, chief, dealer, star, head, lead, more...

secondary, subordinate, minor, auxiliary, incidental

assistant principal, academic principal, more...

assistant, high, first, new, elementary, former, undisclosed, vice, late, original, present

most significant,   main person,   core principle,   most major,   school leader,   one of the main,   the main one,   main one,   head of school,   head master