gag rule vs parliamentary law

gag rule and parliamentary law both are nouns.

Word	Noun	Adjective	Verb	Adverb
gag rule	Yes	No	No	No
parliamentary law	Yes	No	No	No

As nouns, parliamentary law is a hypernym of gag rule; that is, parliamentary law is a word with a broader meaning than gag rule:

Other hypernyms of gag rule include order, parliamentary procedure, rules of order.

gag rule (noun)	parliamentary law (noun)
a rule for limiting or ending debate in a deliberative body	a body of rules followed by an assembly