KEY: Send back.

SYN: Relegate, remand, transfer.

=

KEY: Senile.

SYN: Aged, imbecile, doting.

ANT: Juvenile, vigorous, virile, manly.

=

KEY: Seniority.

SYN: Eldership, priority, superiority.

ANT: Juniority, inferiority, posteriority, subordination.