Roman law vs civil law

Roman law and civil law both are nouns.

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

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

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

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

Roman law (noun)	civil 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