natural philosophy vs physics

natural philosophy and physics both are nouns.

Word	Noun	Adjective	Verb	Adverb
natural philosophy	Yes	No	No	No
physics	Yes	No	No	No

As nouns, natural philosophy and physics are synonyms defined as:

natural philosophy and physics: the science of matter and energy and their interactions

natural philosophy (noun)	physics (noun)
the science of matter and energy and their interactions	the science of matter and energy and their interactions
	the physical properties, phenomena, and laws of something