Planck's law vs natural philosophy

Planck's law and natural philosophy both are nouns.

Word	Noun	Adjective	Verb	Adverb
Planck's law	Yes	No	No	No
natural philosophy	Yes	No	No	No

Planck's law (noun)	natural philosophy (noun)
(physics) the basis of quantum theory; the energy of electromagnetic waves is contained in indivisible quanta that have to be radiated or absorbed as a whole; the magnitude is proportional to frequency where the constant of proportionality is given by Planck's constant	the science of matter and energy and their interactions