countercoup vs coup

countercoup and coup both are nouns.

Word	Noun	Adjective	Verb	Adverb
countercoup	Yes	No	No	No
coup	Yes	No	No	No

As nouns, coup is a hypernym of countercoup; that is, coup is a word with a broader meaning than countercoup:

countercoup: a sudden and decisive overthrow of a government that gained power by a coup d'etat
coup: a sudden and decisive change of government illegally or by force

Other hypernyms of countercoup include coup d'etat, putsch, takeover.

countercoup (noun)	coup (noun)
a sudden and decisive overthrow of a government that gained power by a coup d'etat	a sudden and decisive change of government illegally or by force
	a brilliant and notable success