affiliation vs solitude

affiliation

noun
  • The relationship resulting from affiliating one thing with another. 

  • A club, society or umbrella organisation so formed, especially a trade union. 

  • The establishment of a child's paternity or maternity 

solitude

noun
  • A lonely or deserted place. 

  • Aloneness; the state of being alone, solitary, or by oneself. 

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