senior

/หˆsinjษš/
noun
  1. 1

    An old person.

  2. 2

    Someone older than someone else (with possessive).

    โ€œHe was four years her senior.โ€

  3. 3

    Someone seen as deserving respect or reverence because of their age.

  4. 4

    An elder or presbyter in the early Church.

  5. 5

    Somebody who is higher in rank, dignity, or office.

  6. 6

    A final-year student at a high school or university.

Antonyms

adjective
  1. 1

    Older; superior

    โ€œsenior citizenโ€

  2. 2

    Higher in rank, dignity, or office.

    โ€œsenior member; senior counselโ€

  3. 3

    Of or pertaining to a student's final academic year at a high school (twelfth grade) or university.

Source: https://en.wiktionary.org/wiki/senior