singing vs susurration

singing

noun
  • The act of using the voice to produce musical sounds; vocalizing. 

  • A gathering for the purpose of singing shape note songs. 

  • Disclosing information, or giving evidence about another. 

adj
  • Producing a whistling sound due to the escape of steam. 

  • Smooth and flowing. 

susurration

noun
  • A low and indistinct whispering sound; a murmur. 

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