flare-up vs salvo

flare-up and salvo both are nouns.

Word	Noun	Adjective	Verb	Adverb
flare-up	Yes	No	No	No
salvo	Yes	No	No	No

As nouns, salvo is a hyponym of flare-up; that is, salvo is a word with a more specific, narrower meaning than flare-up:

flare-up: a sudden intense happening
salvo: an outburst resembling the discharge of firearms or the release of bombs

Other hyponyms of flare-up include rush.

flare-up (noun)	salvo (noun)
a sudden intense happening	rapid simultaneous discharge of firearms
	a sudden outburst of cheers
	an outburst resembling the discharge of firearms or the release of bombs