foe vs pal

foe

noun

  • An enemy. 

  • A unit of energy equal to 10⁴⁴ joules. 

pal

noun

  • An informal term of address, often used ironically in a hostile way. 

  • A friend, buddy, mate, cobber; someone to hang around with. 

verb

  • Be friends with, hang around with. 

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