decay vs natural philosophy

decay and natural philosophy both are nouns.

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

decay (noun)	natural philosophy (noun)
the organic phenomenon of rotting	the science of matter and energy and their interactions
a gradual decrease; as of stored charge or current
the process of gradually becoming inferior
the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
an inferior state resulting from the process of decaying

decay (verb)	natural philosophy (verb)
fall into decay or ruin
lose a stored charge, magnetic flux, or current
undergo decay or decomposition