coup d'etat vs coup

coup d'etat and coup both are nouns.

Word	Noun	Adjective	Verb	Adverb
coup d'etat	Yes	No	No	No
coup	Yes	No	No	No

As nouns, coup d'etat and coup are synonyms defined as:

coup d'etat and coup: a sudden and decisive change of government illegally or by force

Other synonyms of coup d'etat include putsch, takeover.

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