identify vs sift out

identify

verb
  • To establish the taxonomic classification of an organism. 

  • To disclose the identity of someone. 

  • To equate or make the same; to unite or combine into one. 

  • To claim an identity; to describe oneself as a member of a group; to assert the use of a particular term to describe oneself. 

  • To establish the identity of someone or something. 

  • To have a strong affinity with; to feel oneself to be modelled on or connected to. 

  • To associate oneself with some group; to feel, or believe one feels, the same way. 

sift out

verb
  • To isolate or identify one particular thing from a collection that includes less relevant things. 

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