appraise vs think of

appraise

verb
  • To estimate; to conjecture. 

  • To consider comprehensively. 

  • To apprise, inform. 

  • To determine the value or worth of (something), particularly as a person appointed for this purpose. 

  • To judge the performance of someone, especially a worker. 

  • To praise; to commend. 

think of

verb
  • Used other than figuratively or idiomatically: see think, of. (to think on the subject of) 

  • To create in one's mind; to originate an idea through thought. 

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