lethargy vs snoozer

lethargy

noun
  • A condition characterized by extreme fatigue or drowsiness, deep unresponsiveness, or prolonged sleep patterns. 

  • A state of extreme torpor or apathy, especially with lack of emotion, energy or enthusiasm; (loosely) sluggishness, laziness. 

snoozer

noun
  • Something that is boring, uninteresting or unremarkable; something that would tend to induce sleep. 

  • One who snoozes; a sleeper. 

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