optics vs natural philosophy

optics and natural philosophy both are nouns.

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

As nouns, natural philosophy is a hypernym of optics; that is, natural philosophy is a word with a broader meaning than optics:

Other hypernyms of optics include physics.

optics (noun)	natural philosophy (noun)
optical properties	the science of matter and energy and their interactions
the branch of physics that studies the physical properties of light