Avogadro's law vs law of nature

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

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

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

Avogadro's law: the principle that equal volumes of all gases (given the same temperature and pressure) contain equal numbers of molecules
law of nature: a generalization that describes recurring facts or events in nature

Other hypernyms of Avogadro's law include law.

Avogadro's law (noun)	law of nature (noun)
the principle that equal volumes of all gases (given the same temperature and pressure) contain equal numbers of molecules	a generalization that describes recurring facts or events in nature