separate vs unbutton

separate

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). 

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. 

unbutton

verb
  • To open (something) by undoing its buttons. 

  • To come open by having its buttons unfastened. 

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