chaperone vs cicerone

chaperone

verb
  • To act as a chaperone. 

  • To work as a chaperone. 

noun
  • An older person who accompanies other younger people to ensure the propriety of their behaviour, often an older woman accompanying a young woman. 

  • A protein that assists the non-covalent folding/unfolding and the assembly/disassembly of other macromolecular structures, but does not occur in these structures when the latter are performing their normal biological functions. 

  • An employee sent by a British company to the European Union to work with a client there, to circumvent restrictions imposed after Brexit. 

cicerone

noun
  • A guide who accompanies visitors and sightseers to museums, galleries, etc., and explains matters of archaeological, antiquarian, historic or artistic interest.. 

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