compassion vs solicitude

compassion

noun
  • Deep awareness of the suffering of another, coupled with the wish to relieve it. 

solicitude

noun
  • Special or pronounced concern or attention. 

  • The state of being solicitous; uneasiness of mind occasioned by fear of evil or desire for good; anxiety. 

  • A cause of anxiety or concern. 

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