'Lord' in the Bible

And Joab said, Jehovah add to his people, how many soever they be, a hundredfold: are they not all, my lord O king, my lord's servants? why does my lord require this thing? why should he become a trespass to Israel?

And Ornan said to David, Take it to thee, and let my lord the king do that which is good in his sight: see, I give the oxen for the burnt-offering, and the threshing-sledges for wood, and the wheat for the oblation; I give it all.