PA vs Pa.

PA and Pa. both are nouns.

Word	Noun	Adjective	Verb	Adverb
PA	Yes	No	No	No
Pa.	Yes	No	No	No

As nouns, PA and Pa. are synonyms defined as:

PA and Pa.: a Mid-Atlantic state; one of the original 13 colonies, with capital Harrisburg

Other synonyms of PA include Keystone State, Pennsylvania.

PA (noun)	Pa. (noun)
an electronic amplification system used as a communication system in public areas	a Mid-Atlantic state; one of the original 13 colonies, with capital Harrisburg
a Mid-Atlantic state; one of the original 13 colonies, with capital Harrisburg