nanny vs keeper

nanny and keeper both are nouns.

Word	Noun	Adjective	Verb	Adverb
nanny	Yes	No	No	No
keeper	Yes	No	No	No

As nouns, keeper is a hypernym of nanny; that is, keeper is a word with a broader meaning than nanny:

Other hypernyms of nanny include adult female, woman.

nanny (noun)	keeper (noun)
female goat	one having charge of buildings or grounds or animals
a woman who is the custodian of children	someone in charge of other people