indigestion vs dyspepsia

indigestion and dyspepsia both are nouns.

Word	Noun	Adjective	Verb	Adverb
indigestion	Yes	No	No	No
dyspepsia	Yes	No	No	No

As nouns, indigestion and dyspepsia are synonyms defined as:

indigestion and dyspepsia: a disorder of digestive function characterized by discomfort or heartburn or nausea

Other synonyms of indigestion include stomach upset, upset stomach.

indigestion (noun)	dyspepsia (noun)
a disorder of digestive function characterized by discomfort or heartburn or nausea	a disorder of digestive function characterized by discomfort or heartburn or nausea