mass hysteria vs frenzy

mass hysteria and frenzy both are nouns.

Word	Noun	Adjective	Verb	Adverb
mass hysteria	Yes	No	No	No
frenzy	Yes	No	No	No

As nouns, frenzy is a hypernym of mass hysteria; that is, frenzy is a word with a broader meaning than mass hysteria:

mass hysteria: a condition in which a large group of people exhibit the same state of violent mental agitation
frenzy: state of violent mental agitation

Other hypernyms of mass hysteria include craze, delirium, fury, hysteria.

mass hysteria (noun)	frenzy (noun)
a condition in which a large group of people exhibit the same state of violent mental agitation	state of violent mental agitation