frenzy vs mass hysteria

frenzy and mass hysteria both are nouns.

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

As nouns, mass hysteria is a hyponym of frenzy; that is, mass hysteria is a word with a more specific, narrower meaning than frenzy:

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

Other hyponyms of frenzy include nympholepsy, epidemic hysertia.

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