prayer vs commination

prayer and commination both are nouns.

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

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

prayer: reverent petition to a deity
commination: prayers proclaiming God's anger against sinners; read in the Church of England on Ash Wednesday

prayer (noun)	commination (noun)
the act of communicating with a deity (especially as a petition or in adoration or contrition or thanksgiving)	a threat of divine punishment or vengeance
earnest or urgent request	prayers proclaiming God's anger against sinners; read in the Church of England on Ash Wednesday
a fixed text used in praying
reverent petition to a deity
someone who prays to God