existent vs existence

existent is not a noun while existence is a noun.

Word	Noun	Adjective	Verb	Adverb
existent	No	Yes	No	No
existence	Yes	No	No	No

existent (noun)	existence (noun)
	everything that exists anywhere
	the state or fact of existing

existent (adjective)	existence (adjective)
having existence or being or actuality
being or occurring in fact or actuality; having verified existence; not illusory
presently existing in fact and not merely potential or possible