excited vs natural philosophy

excited is not a noun while natural philosophy is a noun.

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

excited (noun)	natural philosophy (noun)
	the science of matter and energy and their interactions

excited (adjective)	natural philosophy (adjective)
in an aroused state
(of persons) excessively affected by emotion
(of e.g. a molecule) made reactive or more reactive
marked by uncontrolled excitement or emotion