alto vs viola

alto

noun
  • A person or musical instrument that performs the alto part. 

  • A musical part or section higher than tenor and lower than soprano, formerly the part that performed a countermelody above the tenor or main melody. 

  • An alto saxophone 

viola

noun
  • A person who plays the viola. 

  • A 10-string steel-string acoustic guitar, used in Brazilian folk music. 

  • An organ stop having a similar tone. 

  • A berimbau viola, the smallest member of the berimbau used in capoeira music. 

  • Any of several flowering plants, of the genus Viola, including the violets and pansies. 

  • A stringed instrument of the violin family, somewhat larger than a violin, played under the chin, and having a deeper tone. 

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