MS vs Mississippi

MS

noun
  • M/S: Initialism of motor ship. 

Mississippi

name
  • A major river in the United States that flows from north-central Minnesota into the Gulf of Mexico. 

  • A state of the United States. 

  • A river in Canada that flows from eastern Ontario into the Ottawa River. 

intj
  • Used in a common chronometric counting scheme, in which each iteration is sequentially numbered and supposed to be approximately one second in length. 

noun
  • A recitation of “Mississippi” (interjection). 

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