CIS vs Commonwealth of Independent States

CIS and Commonwealth of Independent States both are nouns.

Word	Noun	Adjective	Verb	Adverb
CIS	Yes	No	No	No
Commonwealth of Independent States	Yes	No	No	No

As nouns, CIS and Commonwealth of Independent States are synonyms defined as:

CIS and Commonwealth of Independent States: an alliance made up of states that had been Soviet Socialist Republics in the Soviet Union prior to its dissolution in Dec 1991

CIS (noun)	Commonwealth of Independent States (noun)
an alliance made up of states that had been Soviet Socialist Republics in the Soviet Union prior to its dissolution in Dec 1991	an alliance made up of states that had been Soviet Socialist Republics in the Soviet Union prior to its dissolution in Dec 1991