malaise vs sickness

malaise

noun
  • A feeling of general bodily discomfort, fatigue or unpleasantness, often at the onset of illness. 

  • An ambiguous feeling of mental or moral depression. 

  • Ill will or hurtful feelings for others or someone. 

sickness

noun
  • Nausea; qualmishness; as, sickness of stomach. 

  • The analogical misuse of a rarer or marked grammatical case in the place of a more common or unmarked case. 

  • The quality or state of being sick or diseased; illness. 

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