downtime vs latency

downtime

noun
  • A period of time set aside for rest and relaxation; leisure time. 

  • The amount of time lost due to forces beyond one's control, as with a computer crash. 

latency

noun
  • Dormancy; the state of being inactive. 

  • A delay, an interval between the initiation of something and the occurrence. 

  • The delay between a stimulus and the response it triggers in an organism. 

  • Concealment; the state of being latent; the state of being hidden. 

  • A stage in Sigmund Freud's psychoanalytic theory of the psychosexual development of children where children become asexual until their sexual desires come back at puberty. 

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