goitre vs struma

goitre

noun
  • An enlargement of the front and sides of the neck caused by inflammation of the thyroid gland. 

struma

noun
  • A scrofulous swelling; a tumour or goitre. 

  • Scrofula. 

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