civil law vs Roman law

civil law and Roman law both are nouns.

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

As nouns, civil law and Roman law are synonyms defined as:

civil law and Roman law: the legal code of ancient Rome; codified under Justinian; the basis for many modern systems of civil law

Other synonyms of civil law include jus civile, Justinian code.

civil law (noun)	Roman law (noun)
the legal code of ancient Rome; codified under Justinian; the basis for many modern systems of civil law	the legal code of ancient Rome; codified under Justinian; the basis for many modern systems of civil law
the body of laws established by a state or nation for its own regulation