copula vs hitch

copula

noun
  • A device that connects two or more keyboards of an organ. 

  • A word, usually a verb, used to link the subject of a sentence with a predicate (usually a subject complement or an adverbial), that unites or associates the subject with the predicate. 

  • A function that represents the association between two or more variables, independent of the individual marginal distributions of the variables. 

  • The act of copulation; mating. 

hitch

noun
  • Any of various knots used to attach a rope to an object other than another rope. 

  • A fastener or connection point, as for a trailer. 

  • A large Californian minnow, Lavinia exilicauda. 

  • A problem, delay or source of difficulty. 

  • A sudden pull. 

  • A period of time spent in the military. 

  • A hidden or unfavorable condition or element. 

verb
  • To strike the legs together in going, as horses; to interfere. 

  • To attach, tie or fasten. 

  • To pull with a jerk. 

  • To marry oneself to; especially to get hitched. 

  • To become entangled or caught; to be linked or yoked; to unite; to cling. 

  • To move interruptedly or with halts, jerks, or steps; said of something obstructed or impeded. 

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