diaphragmatic pleurisy vs epidemic myalgia

diaphragmatic pleurisy and epidemic myalgia both are nouns.

Word	Noun	Adjective	Verb	Adverb
diaphragmatic pleurisy	Yes	No	No	No
epidemic myalgia	Yes	No	No	No

As nouns, diaphragmatic pleurisy and epidemic myalgia are synonyms defined as:

diaphragmatic pleurisy and epidemic myalgia: an acute infectious disease occurring in epidemic form and featuring paroxysms of pain (usually in the chest)

Other synonyms of diaphragmatic pleurisy include Bornholm disease, epidemic pleurodynia, myosis.

diaphragmatic pleurisy (noun)	epidemic myalgia (noun)
an acute infectious disease occurring in epidemic form and featuring paroxysms of pain (usually in the chest)	an acute infectious disease occurring in epidemic form and featuring paroxysms of pain (usually in the chest)