ductus vs stoma

ductus

noun
  • a duct, tube or canal in the body 

  • a subtle reduction of weight towards the middle of the stroke of the letter 

  • the number of strokes that make up a written letter, and the direction, sequence and speed in which they are written (Compare graph; see also aspect.) 

stoma

noun
  • A small opening in a membrane; a surgically constructed opening, especially one in the abdominal wall that permits the passage of waste after a colostomy or ileostomy. 

  • One of the tiny pores in the epidermis of a leaf or stem through which gases and water vapor pass. 

  • A mouthlike opening, such as the oral cavity of a nematode. 

  • An artificial anus. 

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