cling to vs depend

cling to

verb
  • Used other than figuratively or idiomatically: see cling, to. 

  • To have an intense emotional dependency on (someone). 

  • To remain by (someone's) side; to refuse to leave the company of. 

depend

verb
  • To hang down; to be sustained by being fastened or attached to something above. 

  • To trust; to have confidence; to rely. 

  • To cause to be contingent or dependent on; to set as a necessity. 

  • To be contingent or conditioned; to have something as a necessary condition; to hinge on. 

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