prayer vs adjuration

prayer and adjuration both are nouns.

Word	Noun	Adjective	Verb	Adverb
prayer	Yes	No	No	No
adjuration	Yes	No	No	No

As nouns, adjuration is a hyponym of prayer; that is, adjuration is a word with a more specific, narrower meaning than prayer:

Other hyponyms of prayer include demagoguery, demagogy, plea, supplication, solicitation, suit, courting, courtship, suit, wooing.

prayer (noun)	adjuration (noun)
the act of communicating with a deity (especially as a petition or in adoration or contrition or thanksgiving)	a solemn and earnest appeal to someone to do something
earnest or urgent request
a fixed text used in praying
reverent petition to a deity
someone who prays to God