'Servant' in the Bible

Then Joshua, the son of Nun, who had been Moses' servant from the time when he was a child, said, My lord Moses, let them be stopped.

My servant Moses is not so; he is true to me in all my house:

With him I will have talk mouth to mouth, openly and not in dark sayings; and with his eyes he will see the form of the Lord: why then had you no fear of saying evil against my servant Moses?

But my servant Caleb, because he had a different spirit in him, and has been true to me with all his heart, him I will take into that land into which he went, and his seed will have it for their heritage.