nanny vs wetnurse

nanny and wetnurse both are nouns.

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

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

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

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