being vs nonexistent

being is a noun but nonexistent is not a noun.

Word	Noun	Adjective	Verb	Adverb
being	Yes	No	No	No
nonexistent	No	Yes	No	No

being (noun)	nonexistent (noun)
a living thing that has (or can develop) the ability to act or function independently
the state or fact of existing

being (adjective)	nonexistent (adjective)
	not having existence or being or actuality