salvo vs outburst

salvo and outburst both are nouns.

Word	Noun	Adjective	Verb	Adverb
salvo	Yes	No	No	No
outburst	Yes	No	No	No

As nouns, outburst is a hypernym of salvo; that is, outburst is a word with a broader meaning than salvo:

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

Other hypernyms of salvo include burst, flare-up.

salvo (noun)	outburst (noun)
rapid simultaneous discharge of firearms	a sudden violent disturbance
a sudden outburst of cheers	an unrestrained expression of emotion
an outburst resembling the discharge of firearms or the release of bombs	a sudden intense happening