explosion vs outburst

explosion and outburst both are nouns.

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

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

Other hypernyms of explosion include blowup, ebullition, effusion, gush.

explosion (noun)	outburst (noun)
the act of exploding or bursting	a sudden violent disturbance
a golf shot from a bunker that typically moves sand as well as the golf ball	an unrestrained expression of emotion
the terminal forced release of pressure built up during the occlusive phase of a stop consonant	a sudden intense happening
a sudden outburst
a violent release of energy caused by a chemical or nuclear reaction
a sudden great increase
the noise caused by an explosion