beau idéal vs nonesuch

beau idéal

noun
  • An emulable eidolon embodying excellence in a particular respect. 

  • Ideal excellence, or an imaginary standard of perfection. 

nonesuch

noun
  • Silene chalcedonica (syn. Lychnis chalcedonica) 

  • A person or thing with no equal. 

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