bigender vs homosexual

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. 

homosexual

adj
  • Between two people of the same sex; gay. 

  • Sexually and/or romantically attracted to members of the same sex, such as a man who is attracted to men or a woman who is attracted to women; gay. (Typically used in the sense of sole/exclusive attraction.) 

noun
  • A person who is sexually attracted solely or primarily to others of the same sex. 

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