tendency vs whitecap

tendency

noun
  • An organised unit or faction within a larger political organisation. 

  • A likelihood of behaving in a particular way or going in a particular direction; a tending toward. 

whitecap

noun
  • A member of a self-appointed vigilante committee that carried out lynchings. Some early ones wore white hoods or masks. 

  • A wave having a white crest; a breaker 

  • Any of several birds having a white patch on the head 

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