Mentor vs Roll

Mentor

name
  • A male given name from Ancient Greek 

  • Odysseus's trusted counselor. He was assigned the responsibility of raising Odysseus's son Telemachus while Odysseus was away fighting in Troy. 

Roll

name
  • A diminutive of the male given name Roland. 

  • A surname. 

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