fore vs front line

fore

noun
  • The front; the forward part of something; the foreground. 

intj
  • An exclamation yelled to inform players a ball is moving in their direction. 

adj
  • Forward; situated towards the front (of something). 

adv
  • In or towards the bows of a ship. 

  • In the part that precedes or goes first; opposed to aft, after, back, behind, etc. 

front line

noun
  • A front, or a boundary between opposing positions. 

  • A low level. 

  • attack, collectively the attackers or forwards. 

  • A site of a conflict, effort, or controversial matter of any kind. 

  • The site of interaction with outsiders, such as customers. 

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