rules of order vs parliamentary law

rules of order and parliamentary law both are nouns.

Word	Noun	Adjective	Verb	Adverb
rules of order	Yes	No	No	No
parliamentary law	Yes	No	No	No

As nouns, rules of order and parliamentary law are synonyms defined as:

rules of order and parliamentary law: a body of rules followed by an assembly

Other synonyms of rules of order include order, parliamentary procedure.

rules of order (noun)	parliamentary law (noun)
a body of rules followed by an assembly	a body of rules followed by an assembly