outburst vs blowup

outburst and blowup both are nouns.

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

As nouns, outburst and blowup are synonyms defined as:

Other synonyms of outburst include ebullition, effusion, gush.

outburst (noun)	blowup (noun)
a sudden violent disturbance	a photographic print that has been enlarged
an unrestrained expression of emotion	an unrestrained expression of emotion
a sudden intense happening	a violent release of energy caused by a chemical or nuclear reaction