excursion vs straightness

excursion

noun
  • An occurrence where an aircraft runs off the end or side of a runway or taxiway, usually during takeoff, landing, or taxi. 

  • A deviation in pitch, for example in the syllables of enthusiastic speech. 

  • A brief recreational trip; a journey out of the usual way. 

  • A wandering from the main subject: a digression. 

verb
  • To go on a recreational trip or excursion. 

straightness

noun
  • The result or product of being straight. 

  • The state or quality of being straight (especially in the sense of "heterosexual"). 

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