Hubble's law vs law of nature

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

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

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

Hubble's law: (astronomy) the generalization that the speed of recession of distant galaxies (the red shift) is proportional to their distance from the observer
law of nature: a generalization that describes recurring facts or events in nature

Other hypernyms of Hubble's law include law.

Hubble's law (noun)	law of nature (noun)
(astronomy) the generalization that the speed of recession of distant galaxies (the red shift) is proportional to their distance from the observer	a generalization that describes recurring facts or events in nature