Dictionary.com

sickness vs. illness

[ sik-nis ]
/ ˈsɪk nɪs /

noun
  1. a particular disease or malady.
  2. the state or an instance of being sick; illness.
  3. nausea; queasiness.
[ il-nis ]
/ ˈɪl nɪs /

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.
  3. wickedness.

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