U.S. Constitution vs fundamental law

U.S. Constitution and fundamental law both are nouns.

Word	Noun	Adjective	Verb	Adverb
U.S. Constitution	Yes	No	No	No
fundamental law	Yes	No	No	No

U.S. Constitution (noun)	fundamental law (noun)
the constitution written at the Constitutional Convention in Philadelphia in 1787 and subsequently ratified by the original thirteen states	law determining the fundamental political principles of a government