From Wiktionary, the free dictionary
From nanny + -dom.
nannydom (uncountable)
- The realm or sphere of nannies.
2009 February 27, Susan Dominus, “Becoming a Nanny: Less Money, More Joy”, in New York Times[1]:[…] some of the aspects of nannydom that are sheer drudgery: changing diapers and washing bottles and singing nonsense songs over and over.