sickness vs. illness

sickness

noun

  1. a particular disease or malady.
  2. the state or an instance of being sick; illness.
  3. nausea; queasiness.

illness

noun

  1. poor health; sickness:

    He grew up in an environment known for poverty, illness, and little opportunity for education.

  2. a specific sickness or disease, or an instance of such:

    Please be as accurate as possible in listing your childhood illnesses.

    Synonyms: , ,

  3. Obsolete. wickedness.