California vs CA

California and CA both are nouns.

Word	Noun	Adjective	Verb	Adverb
California	Yes	No	No	No
CA	Yes	No	No	No

As nouns, California and CA are synonyms defined as:

California and CA: a state in the western United States on the Pacific; the 3rd largest state; known for earthquakes

Other synonyms of California include Calif., Golden State.

California (noun)	CA (noun)
a state in the western United States on the Pacific; the 3rd largest state; known for earthquakes	a state in the western United States on the Pacific; the 3rd largest state; known for earthquakes