Mariotte's law vs law of nature

Mariotte's law and law of nature both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mariotte's law	Yes	No	No	No
law of nature	Yes	No	No	No

As nouns, law of nature is a hypernym of Mariotte's law; that is, law of nature is a word with a broader meaning than Mariotte's law:

Mariotte's law: the pressure of an ideal gas at constant temperature varies inversely with the volume
law of nature: a generalization that describes recurring facts or events in nature

Other hypernyms of Mariotte's law include law.

Mariotte's law (noun)	law of nature (noun)
the pressure of an ideal gas at constant temperature varies inversely with the volume	a generalization that describes recurring facts or events in nature