biff vs whack

biff

verb
  • To punch or hit. 

  • To discard; to throw out; to throw away. 

  • To wipe out; to faceplant; to fall. 

intj
  • The sound of a person being punched or hit. 

noun
  • A sudden, sharp blow or punch. 

  • A wipeout. 

whack

verb
  • To hit, slap or strike. 

  • To kill, bump off. 

  • To surpass; to better. 

  • To beat convincingly; to thrash. 

  • To share or parcel out (often with up). 

noun
  • An attempt, a chance, a turn, a go, originally an attempt to beat someone or something. 

  • The sound of a heavy strike. 

  • The strike itself. 

  • The backslash, ⟨ \ ⟩. 

  • The stroke itself, regardless of its successful impact. 

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