Vincent's angina vs contagion

Vincent's angina and contagion both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vincent's angina	Yes	No	No	No
contagion	Yes	No	No	No

As nouns, contagion is a hypernym of Vincent's angina; that is, contagion is a word with a broader meaning than Vincent's angina:

Vincent's angina: an acute communicable infection of the respiratory tract and mouth marked by ulceration of the mucous membrane
contagion: any disease easily transmitted by contact

Other hypernyms of Vincent's angina include contagious disease, angina.

Vincent's angina (noun)	contagion (noun)
an acute communicable infection of the respiratory tract and mouth marked by ulceration of the mucous membrane	the communication of an attitude or emotional state among a number of people
	an incident in which an infectious disease is transmitted
	any disease easily transmitted by contact