maritime law vs law of nations

maritime law and law of nations both are nouns.

Word	Noun	Adjective	Verb	Adverb
maritime law	Yes	No	No	No
law of nations	Yes	No	No	No

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

maritime law: the branch of international law that deals with territorial and international waters or with shipping or with ocean fishery etc.
law of nations: the body of laws governing relations between nations

Other hypernyms of maritime law include international law.

maritime law (noun)	law of nations (noun)
the branch of international law that deals with territorial and international waters or with shipping or with ocean fishery etc.	the body of laws governing relations between nations