kiss of peace vs pax

kiss of peace and pax both are nouns.

Word	Noun	Adjective	Verb	Adverb
kiss of peace	Yes	No	No	No
pax	Yes	No	No	No

As nouns, kiss of peace and pax are synonyms defined as:

kiss of peace and pax: (Roman Catholic Church) a greeting signifying Christian love for those assisting at the Eucharist

kiss of peace (noun)	pax (noun)
(Roman Catholic Church) a greeting signifying Christian love for those assisting at the Eucharist	(Roman Catholic Church) a greeting signifying Christian love for those assisting at the Eucharist