Yes, pax is a Scrabble word!
...and is worth 12 points in Scrabble, and 13 points in Words with Friends
pax
Noun
1. (Roman Catholic Church) a greeting signifying Christian love for those assisting at the Eucharist
What Scrabble words can I make with the letters in pax?
2 Letter Words
Search for more Scrabble words
Words that can be created with an extra letter added to pax:
E:apex