Core vs Pen

Core

name

  • A female given name from Ancient Greek 

  • The birth name of Persephone/Proserpina, the queen of the Underworld/Hades, and goddess of the seasons and of vegetation. She is the daughter of Zeus and Demeter, and the wife of Hades. 

Pen

name

  • A diminutive of the female given name Penelope 

  • The 68th sura (chapter) of the Qur'an. 

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