stroma vs womb

stroma

noun
  • The tissue structure of an organ, etc., that serves to support it. 

womb

noun
  • Any cavity containing and enveloping anything. 

  • In female mammals, the organ in which the young are conceived and grow until birth; the uterus. 

  • A place where something is made or formed. 

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