pax vs kiss of peace

pax and kiss of peace both are nouns.

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

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

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

pax (noun)	kiss of peace (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