parliamentary law vs rules of order

parliamentary law and rules of order both are nouns.

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

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

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

Other synonyms of parliamentary law include order, parliamentary procedure.

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