Noun

• S: (n) indigestion, dyspepsia, stomach upset, upset stomach (a disorder of digestive function characterized by discomfort or heartburn or nausea)
• part meronym
• S: (n) stomachache, stomach ache, bellyache, gastralgia (an ache localized in the stomach or abdominal region)
• direct hypernym / inherited hypernym / sister term
• derivationally related form