collect vs separate

collect

verb
  • To come together in a group or mass. 

  • To get; particularly, get from someone. 

  • To infer; to conclude. 

  • To accumulate (a number of similar or related objects), particularly for a hobby or recreation. 

  • To gather together; amass. 

  • To collect payments. 

  • To collide with or crash into (another vehicle or obstacle). 

adv
  • With payment due from the recipient. 

noun
  • The prayer said before the reading of the epistle lesson, especially one found in a prayerbook, as with the Book of Common Prayer. 

adj
  • To be paid for by the recipient, as a telephone call or a shipment. 

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. 

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

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

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. 

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