TV series example of the word

The Big Bang Theory Season 3, Episode 13
I am the master of my own bladder.

Westworld Season 2, Episode 7
And your master here has plenty of those.

Game of Thrones Season 1, Episode 10
But my master got sick of me, so... here I am.

Game of Thrones Season 3, Episode 1
Master Kraznys asks that you please hurry.

Game of Thrones Season 3, Episode 3
Maybe they're trying to curry some favor with the new Master of Coin.