B-flat vs ri

B-flat

noun
  • The note one semitone below B, notated B♭. 

  • A bedbug. 

ri

noun
  • The solfeggio syllable used to indicate the sharp of the second note of a major scale, enharmonic to me. 

  • Synonym of li as a Korean unit of distance equivalent to about 393 m. 

How often have the words B-flat and ri occurred in a corpus of books? (source: Google Ngram Viewer )