existent vs active

existent is not a noun while active is a noun.

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

existent (noun)	active (noun)
	a person who is a participating member of an organization
	the voice used to indicate that the grammatical subject of the verb is performing the action or causing the happening denoted by the verb
	chemical agent capable of activity

existent (adjective)	active (adjective)
having existence or being or actuality	(used of verbs (e.g. `to run') and participial adjectives (e.g. `running' in `running water')) expressing action rather than a state of being
being or occurring in fact or actuality; having verified existence; not illusory	characterized by energetic activity
presently existing in fact and not merely potential or possible	tending to become more severe or wider in scope
	disposed to take action or effectuate change
	(of e.g. volcanoes) erupting or liable to erupt
	(of e.g. volcanoes) capable of erupting
	full of activity or engaged in continuous activity
	exerting influence or producing a change or effect
	engaged in full-time work
	expressing that the subject of the sentence has the semantic function of actor:
	(of the sun) characterized by an increased occurrence of sunspots and flares and radio emissions
	in operation
	taking part in an activity
	engaged in or ready for military or naval operations