Au pair and Wet-nurse

Au pair noun - A young foreigner who lives with a family in return for doing light housework.

Wet-nurse and au pair are semantically related. In some cases you can replace phrase "Wet-nurse" with "Au pair", this phrases are similar.

Wet-nurse noun - A woman hired to suckle a child of someone else.

Au pair and wet-nurse are semantically related. Sometimes you can use "Au pair" instead a noun phrase "Wet-nurse".