common law vs civil law

common law and civil law both are nouns.

Word	Noun	Adjective	Verb	Adverb
common law	Yes	No	No	No
civil law	Yes	No	No	No

As nouns, civil law is a hypernym of common law; that is, civil law is a word with a broader meaning than common law:

common law: (civil law) a law established by following earlier judicial decisions
civil law: the body of laws established by a state or nation for its own regulation

common law (noun)	civil law (noun)
(civil law) a law established by following earlier judicial decisions	the legal code of ancient Rome; codified under Justinian; the basis for many modern systems of civil law
a system of jurisprudence based on judicial precedents rather than statutory laws	the body of laws established by a state or nation for its own regulation