existence vs existent

existence is a noun but existent is not a noun.

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

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

existence (adjective)	existent (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