nanny vs wet nurse

nanny and wet nurse both are nouns.

Word	Noun	Adjective	Verb	Adverb
nanny	Yes	No	No	No
wet nurse	Yes	No	No	No

As nouns, wet nurse is a hyponym of nanny; that is, wet nurse is a word with a more specific, narrower meaning than nanny:

Other hyponyms of nanny include dry nurse, mammy, amah, wet-nurse, wetnurse.

nanny (noun)	wet nurse (noun)
female goat	a woman hired to suckle a child of someone else
a woman who is the custodian of children