herpangia vs viral infection

herpangia and viral infection both are nouns.

Word	Noun	Adjective	Verb	Adverb
herpangia	Yes	No	No	No
viral infection	Yes	No	No	No

As nouns, viral infection is a hypernym of herpangia; that is, viral infection is a word with a broader meaning than herpangia:

herpangia: a viral infection (usually in children) marked by sore throat and fever and papules in the mouth and throat and headache and abdominal pain; usually subsides in a short time
viral infection: infection by a virus that is pathogenic to humans

Other hypernyms of herpangia include virus infection.

herpangia (noun)	viral infection (noun)
a viral infection (usually in children) marked by sore throat and fever and papules in the mouth and throat and headache and abdominal pain; usually subsides in a short time	infection by a virus that is pathogenic to humans