United States Constitution vs US Constitution

United States Constitution and US Constitution both are nouns.

Word	Noun	Adjective	Verb	Adverb
United States Constitution	Yes	No	No	No
US Constitution	Yes	No	No	No

As nouns, United States Constitution and US Constitution are synonyms defined as:

United States Constitution and US Constitution: the constitution written at the Constitutional Convention in Philadelphia in 1787 and subsequently ratified by the original thirteen states

Other synonyms of United States Constitution include Constitution, Constitution of the United States, U.S. Constitution.

United States Constitution (noun)	US Constitution (noun)
the constitution written at the Constitutional Convention in Philadelphia in 1787 and subsequently ratified by the original thirteen states	the constitution written at the Constitutional Convention in Philadelphia in 1787 and subsequently ratified by the original thirteen states