bass vs countertenor

bass

noun
  • The clef sign that indicates that the pitch of the notes is below middle C; a bass clef. 

  • The perch; any of various marine and freshwater fish resembling the perch, all within the order of Perciformes. 

  • A low spectrum of sound tones. 

  • One who sings in the bass range. 

  • An instrument that plays in the bass range, in particular a double bass, bass guitar, electric bass or bass synthesiser. 

  • A section of musical group that produces low-pitched sound, lower than the baritone and tenor. 

  • Fibers from other plants, especially palm trees 

  • The fibrous inner bark of the linden or lime tree, used for making mats. 

  • Anything made from such fibers, such as a hassock, basket or thick mat. 

adj
  • Of sound, a voice or an instrument, low in pitch or frequency. 

verb
  • To sound in a deep tone. 

countertenor

noun
  • male singing voice far higher than the typical male vocal range 

  • a part or section performing a countermelody against the tenor or main part 

  • adult male singer who uses head tone or falsetto to sing far higher than the typical male vocal range 

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