sho vs xiao

sho

noun
  • A Japanese free reed musical instrument similar to the sheng. 

  • A letter of the Greek alphabet used to write the Bactrian language: uppercase Ϸ, lowercase ϸ. 

xiao

noun
  • A type of Chinese flute. 

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