boss

(noun): A person who oversees and directs the work of others; a supervisor.
(noun): A person in charge of a business or company.
(noun): A leader, the head of an organized group or team.
(noun): The head of a political party in a given region or district.
(noun): A term of address to a man.
(noun): An enemy, often at the end of a level, that is particularly challenging and must be beaten in order to progress.
(noun): Wife.
(verb): To exercise authoritative control over; to tell (someone) what to do, often repeatedly.
(adjective): Of excellent quality, first-rate.

Chat turned to whisper when the boss entered the conference room.
They named him boss because he had good leadership skills.
He is the Republican boss in Kentucky.
Yes, boss.
There's no olive oil; will sunflower oil do? — I'll have to run that by the boss.