'Lord's' in the Bible

And he asked Pharaoh's chamberlains that were with him in custody in his lord's house, saying, Why are your faces so sad to-day?

Behold, the money that we found in our sacks' mouths we have brought again to thee from the land of Canaan; and how should we steal out of thy lord's house silver or gold?

With whomsoever of thy servants it is found, let him die; and we also will be my lord's bondmen.

And Judah said, What shall we say to my lord? what shall we speak, and how justify ourselves? God has found out the iniquity of thy servants; behold, we are my lord's bondmen, both we, and he in whose hand the cup has been found.

Then Judah came near to him, and said, Ah! my lord, let thy servant, I pray thee, speak a word in my lord's ears, and let not thine anger burn against thy servant; for thou art even as Pharaoh.