nausea vs stomachache

nausea

noun
  • A feeling of illness or discomfort in the digestive system, usually characterized by a strong urge to vomit. 

  • Strong dislike or disgust. 

  • Motion sickness. 

stomachache

noun
  • A pain in the abdomen, often caused by indigestion. (The pain is usually lower than the stomach and related to the intestines.) 

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