explosion vs effusion

explosion and effusion both are nouns.

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

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

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

explosion (noun)	effusion (noun)
the act of exploding or bursting	flow under pressure
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 outburst
a violent release of energy caused by a chemical or nuclear reaction
a sudden great increase
the noise caused by an explosion