gag law vs parliamentary law

gag law and parliamentary law both are nouns.

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

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

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

gag law (noun)	parliamentary law (noun)
any law that limits freedom of the press	a body of rules followed by an assembly
a rule for limiting or ending debate in a deliberative body