The Conlang Word for the Master of the Household

I'm actually having this problem in a story that I'm writing right now where I want a word that describes the servant who is directly responsible for the physical care of the master of the household. In the English tradition, the name for that servant is a valid word which you've heard a lot as you've been watching down to Nabi. It's easier for you to use the conlang word and have some way of explaining what that means.