Justinian code vs Roman law

Justinian code and Roman law both are nouns.

Word	Noun	Adjective	Verb	Adverb
Justinian code	Yes	No	No	No
Roman law	Yes	No	No	No

As nouns, Justinian code and Roman law are synonyms defined as:

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

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

Justinian code (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