energy vs natural philosophy

energy and natural philosophy both are nouns.

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

energy (noun)	natural philosophy (noun)
forceful exertion	the science of matter and energy and their interactions
an imaginative lively style (especially style of writing)
enterprising or ambitious drive
(physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs
any source of usable power
a healthy capacity for vigorous activity