solidarity vs urge to merge

solidarity

noun
  • Willingness to give psychological and/or material support when another person is in a difficult position or needs affection. 

  • A bond of unity or agreement between individuals, united around a common goal or against a common enemy, such as the unifying principle that defines the labor movement; mutual support within a group. 

urge to merge

noun
  • A strong desire to form intense emotional connections, stereotypically associated with lesbians. 

How often have the words solidarity and urge to merge occurred in a corpus of books? (source: Google Ngram Viewer )