being vs existing

being is a noun but existing is not a noun.

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

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

being (adjective)	existing (adjective)
	having existence or being or actuality
	presently existing
	existing in something specified