law of nature vs theory

law of nature and theory both are nouns.

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

law of nature (noun)	theory (noun)
a generalization that describes recurring facts or events in nature	a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena
	a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena
	a belief that can guide behavior