combo vs simultaneity

combo

noun
  • A combination. 

  • A strategy aiming to win by playing a specific combination of cards (or similar), often in a single turn. 

  • Two or more gameplay elements (e.g. characters, items) which are powerful when used together. 

  • A Caucasian man who marries or has a sexual relationship with an Aboriginal woman; a Caucasian man who lives among Aboriginal people and adopts Aboriginal culture 

  • A combo box. 

  • A small musical group. 

  • An action composed of a sequence of simpler actions, especially a composite attacking move in a fighting game. 

verb
  • To combine 

simultaneity

noun
  • The quality or state of being simultaneous; simultaneousness. 

  • More than one complete musical texture occurring at the same time. This first appeared in the music of Charles Ives, and is common in the music of Conlon Nancarrow, and others. 

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