Maltese cross vs nonesuch

Maltese cross

noun
  • A flowering plant Lychnis chalcedonica (syn. Silene chalcedonica) of the family Caryophyllaceae 

  • A cross having four equal arms resembling arrowheads joined at the points 

  • Synonym of Geneva wheel 

  • A position on the rings where the gymnast's body is horizontal and straight, with arms to the side; a horizontal planche. 

nonesuch

noun
  • Silene chalcedonica (syn. Lychnis chalcedonica) 

  • A person or thing with no equal. 

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