appraise vs research

appraise

verb
  • To consider comprehensively. 

  • To apprise, inform. 

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

  • To estimate; to conjecture. 

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

  • To praise; to commend. 

research

verb
  • To make an extensive investigation into. 

  • To search or examine with continued care; to seek diligently. 

  • To search again. 

noun
  • Diligent inquiry or examination to seek or revise facts, principles, theories, applications, etc.; laborious or continued search after truth. 

  • The research station that houses Wang and his team is outside Lijiang, a city of about 1.2 million people. File:The research station that houses Wang and his team is outside Lijiang.ogg 

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