X vs crossover

X

noun
  • Any mark that looks like that letter, such as a mark made by a person who cannot read or write in lieu of a signature. 

  • Cross, crossing. 

  • The spot behind the goal. 

  • Ecstasy, a particular street drug. 

num
  • An unknown quantity or unknown value. 

character
  • The twenty-fourth letter of the English alphabet, called ex and written in the Latin script. 

name
  • A surname, used by those who have had their identity or heritage, including their proper ancestral names, erased or forgotten. 

  • Christ 

  • A placeholder for an unknown, suppressed or hypothetical name. 

adj
  • Obscene. 

  • Intersex or non-binary (in passports and identification documents). 

crossover

noun
  • A blend of multiple styles of music or multiple film genres, intended to appeal to a wider audience. 

  • A move in sports that involves crossing one hand or foot in front of another, as in ice skating. 

  • The point at which the relative humidity is less than, or equal to, the ambient air temperature. 

  • The means by which the crossing is made. 

  • An SUV-like automobile built on a passenger car platform, e.g. the Pontiac Torrent. 

  • A piece of fiction that borrows elements from two or more fictional universes. 

  • A pair of switches and a short, diagonal length of track which together connect two parallel tracks and allow passage between them. 

  • An athlete or swimmer who has competed in more than one of open water swimming, pool swimming, triathlon, and endurance sports. 

  • A place where one thing crosses over another. 

  • The result of the exchange of genetic material during meiosis. 

  • A crossover dribble. 

adj
  • Configured so that the transmit signals at one end are connected to the receive signals at the other. 

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