measle vs measles

measle

noun
  • A tapeworm larva. 

  • A red spot of the kind that appears on the skin of someone suffering from measles. 

measles

noun
  • Synonym of cysticercosis: A disease of livestock or meat caused by the presence of tapeworm larvae. 

  • An acute and highly contagious disease which often afflicts children caused by the virus Measles morbillivirus and causing red rashes, fever, runny nose, coughing, and red eyes. 

  • A discreet assassination made to look like death from any natural cause. 

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