solitary wave vs natural philosophy

solitary wave and natural philosophy both are nouns.

Word	Noun	Adjective	Verb	Adverb
solitary wave	Yes	No	No	No
natural philosophy	Yes	No	No	No

solitary wave (noun)	natural philosophy (noun)
(physics) a quantum of energy or quasiparticle that can be propagated as a traveling wave in nonlinear systems and is neither preceded nor followed by another such disturbance; does not obey the superposition principle and does not dissipate	the science of matter and energy and their interactions