vicarious
Meaning: experiencing through another
Usage: Maya felt vicarious excitement as she listened to her brother describe his first debate victory.
surrogate
Meaning: one acting in place of another
Usage: When the principal was away, the assistant principal served as her surrogate at the meeting.
proxy
Meaning: one authorized to act for another
Usage: Ava served as her brother’s proxy and voted on his behalf.
intermediary
Meaning: one who acts between people or groups
Usage: The counselor served as an intermediary during the disagreement.
substitute
Meaning: one who takes the place of another
Usage: When the lead actor became ill, a substitute performed the role.