au pair vs ayah

au pair

noun
  • A single girl (or, rarely, a boy), usually a foreigner, who helps a host family with childcare, housework, or both while staying as a guest with a host family, and generally receives a small allowance (or pocket money). 

ayah

noun
  • A South Asian female servant, maid or nanny, historically, often one working for Europeans in South Asia. 

  • A verse in the Quran. 

How often have the words au pair and ayah occurred in a corpus of books? (source: Google Ngram Viewer )