outburst vs explosion

outburst and explosion both are nouns.

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

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

Other hyponyms of outburst include acting out, cry, flare.

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