big bang vs detonation

big bang and detonation both are nouns.

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

As nouns, detonation is a hypernym of big bang; that is, detonation is a word with a broader meaning than big bang:

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

Other hypernyms of big bang include blowup, explosion.

big bang (noun)	detonation (noun)
(cosmology) the cosmic explosion that is hypothesized to have marked the origin of the universe	the act of detonating an explosive
	a violent release of energy caused by a chemical or nuclear reaction