law of motion vs law of nature

law of motion and law of nature both are nouns.

Word	Noun	Adjective	Verb	Adverb
law of motion	Yes	No	No	No
law of nature	Yes	No	No	No

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

law of motion: one of three basic laws of classical mechanics
law of nature: a generalization that describes recurring facts or events in nature

Other hypernyms of law of motion include law.

law of motion (noun)	law of nature (noun)
one of three basic laws of classical mechanics	a generalization that describes recurring facts or events in nature