bigender vs fluid

bigender

adj
  • Having two genders simultaneously: both male and female. 

  • Having a tendency to move between feminine and masculine gender-typed behaviour depending on context. 

fluid

adj
  • Genderfluid. 

  • In a state of flux; subject to change. 

  • Of or relating to fluid. 

  • Moving smoothly, or giving the impression of a liquid in motion. 

  • Convertible into cash. 

noun
  • Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma. 

  • A liquid (as opposed to a solid or gas). 

  • Intravenous fluids. 

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