ladyboy vs transsexual

ladyboy

noun
  • A trans woman or transfeminine person in or from Asia. 

transsexual

noun
  • A transsexual person. 

adj
  • Having changed, or being in the process of changing, physical sex (because it does not match desired sex) by undergoing medical treatment such as hormone replacement therapy (HRT) and optionally sex reassignment surgery (SRS), or rarely only SRS. 

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