imprecation vs execration

imprecation and execration both are nouns.

Word	Noun	Adjective	Verb	Adverb
imprecation	Yes	No	No	No
execration	Yes	No	No	No

As nouns, execration is a hypernym of imprecation; that is, execration is a word with a broader meaning than imprecation:

imprecation: the act of calling down a curse that invokes evil (and usually serves as an insult)
execration: an appeal to some supernatural power to inflict evil on someone or some group

Other hypernyms of imprecation include condemnation, curse.

imprecation (noun)	execration (noun)
the act of calling down a curse that invokes evil (and usually serves as an insult)	the object of cursing or detestation; that which is execrated
a slanderous accusation	an appeal to some supernatural power to inflict evil on someone or some group
	hate coupled with disgust