bias-free vs gender-free

bias-free

gender-free

adj
  • Agender, being neither male nor female nor any third gender; free of gender. 

  • Acceptable for or available to any gender. 

  • Which does not define people in the basis of gender; in which gender is irrelevant to people's lives and choices. 

How often have the words bias-free and gender-free occurred in a corpus of books? (source: Google Ngram Viewer )