natural philosophy vs excited

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

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

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

natural philosophy (adjective)	excited (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