higher-up

/HH AY1 ER0 AH1 P/
noun
  1. 1

    Somebody with greater authority, seniority, rank, status or position; one who outranks.

    โ€œIt's a great plan, but we'll have to get approval from the higher-ups to proceed.โ€

Source: https://en.wiktionary.org/wiki/higher-up