supplication vs plea

supplication and plea both are nouns.

Word	Noun	Adjective	Verb	Adverb
supplication	Yes	No	No	No
plea	Yes	No	No	No

As nouns, supplication and plea are synonyms defined as:

supplication and plea: a humble request for help from someone in authority

supplication (noun)	plea (noun)
the act of communicating with a deity (especially as a petition or in adoration or contrition or thanksgiving)	an answer indicating why a suit should be dismissed
a prayer asking God's help as part of a religious service	a humble request for help from someone in authority
a humble request for help from someone in authority	(law) a defendant's answer by a factual matter (as distinguished from a demurrer)