outburst vs salvo

outburst and salvo both are nouns.

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

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

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

Other hyponyms of outburst include rush.

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