blowup vs big bang

blowup and big bang both are nouns.

Word	Noun	Adjective	Verb	Adverb
blowup	Yes	No	No	No
big bang	Yes	No	No	No

As nouns, big bang is a hyponym of blowup; that is, big bang is a word with a more specific, narrower meaning than blowup:

blowup: a violent release of energy caused by a chemical or nuclear reaction
big bang: (cosmology) the cosmic explosion that is hypothesized to have marked the origin of the universe

Other hyponyms of blowup include airburst, blast, backfire, backfire, blowback, fragmentation, inflation.

blowup (noun)	big bang (noun)
a photographic print that has been enlarged	(cosmology) the cosmic explosion that is hypothesized to have marked the origin of the universe
an unrestrained expression of emotion
a violent release of energy caused by a chemical or nuclear reaction