someone else
Definitions
A person other than the one previously mentioned or currently being considered.
An individual distinct from oneself or the group currently involved.
Examples
I think you should ask someone else for help with this project.
She decided to give the ticket to someone else since she couldn't attend the concert.
It is not fair to blame someone else for your own mistakes.
Synonyms
another a third party somebody else an outsider a stranger the other person a different individual