dyspeptic vs sibilatory

dyspeptic

adj
  • Irritable or morose. 

  • Of, relating to, or having dyspepsia or indigestion. 

noun
  • A dyspeptic person. 

sibilatory

adj
  • hissing; sibilant 

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