background vs blood

background

noun
  • One's social heritage, or previous life; what one did in the past. 

  • Information relevant to the current situation about past events; history. 

  • The image or color over which a computer's desktop items are shown (e.g. icons or application windows). 

  • A part of the picture that depicts scenery to the rear or behind the main subject; context. 

  • A less important feature of scenery (as opposed to foreground). 

  • A type of activity on a computer that is not normally visible to the user. 

adj
  • Less important or less noticeable in a scene or system. 

verb
  • To put in a position that is not prominent. 

  • To gather and provide background information (on). 

blood

noun
  • A friend or acquaintance, especially one who is black and male. 

  • A blood test or blood sample. 

  • Temper of mind; disposition; mood 

  • Bloodshed. 

  • The juice of anything, especially if red. 

  • A vital liquid flowing in the bodies of many types of animals that usually conveys nutrients and oxygen. In vertebrates, it is colored red by hemoglobin, is conveyed by arteries and veins, is pumped by the heart and is usually generated in bone marrow. 

  • One of the four humours in the human body. 

  • A blood horse, one of good pedigree. 

  • The sap or juice which flows in or from plants. 

  • A family relationship due to birth, such as that between siblings; contrasted with relationships due to marriage or adoption (see blood relative, blood relation, by blood). 

verb
  • To cause something to be covered with blood; to bloody. 

  • To let blood (from); to bleed. 

  • To initiate into warfare or a blood sport, traditionally by smearing with the blood of the first kill witnessed. 

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