cull vs separate

cull

verb
  • To select animals from a group and then kill them in order to reduce the numbers of the group in a controlled manner. 

  • To pick or take someone or something (from a larger group). 

  • To kill (animals etc). 

  • To lay off in order to reduce the size of, get rid of. 

  • To gather, collect. 

noun
  • A lobster having only one claw. 

  • A selection. 

  • An individual animal selected to be killed, or item of produce to be discarded. 

  • A piece unfit for inclusion within a larger group; an inferior specimen. 

  • An organised killing of selected animals. 

  • A fool, gullible person; a dupe. 

separate

verb
  • To disunite from a group or mass; to disconnect. 

  • To divide (a thing) into separate parts. 

  • To cause (things or people) to be separate. 

  • To divide itself into separate pieces or substances. 

noun
  • A printing of an article from a periodical as its own distinct publication and distributed independently, often with different page numbers. 

  • Anything that is sold by itself, especially articles of clothing such as blouses, skirts, jackets, and pants. 

adj
  • Apart from (the rest); not connected to or attached to (anything else). 

  • Not together (with); not united (to). 

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