contusion vs ulcer

contusion

noun
  • Synonym of bruising. 

  • Synonym of bruise. 

ulcer

noun
  • Anything that festers and corrupts like an open sore; a vice in character. 

  • Peptic ulcer. 

  • An open sore of the skin, eyes or mucous membrane, often caused by an initial abrasion and generally maintained by an inflammation and/or an infection. 

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