constitution vs fundamental law

constitution and fundamental law both are nouns.

Word	Noun	Adjective	Verb	Adverb
constitution	Yes	No	No	No
fundamental law	Yes	No	No	No

As nouns, constitution and fundamental law are synonyms defined as:

constitution and fundamental law: law determining the fundamental political principles of a government

Other synonyms of constitution include organic law.

constitution (noun)	fundamental law (noun)
the act of forming or establishing something	law determining the fundamental political principles of a government
the way in which someone or something is composed
law determining the fundamental political principles of a government