existent vs objective

existent is not a noun while objective is a noun.

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

existent (noun)	objective (noun)
	the lens or system of lenses in a telescope or microscope that is nearest the object being viewed
	the goal intended to be attained (and which is believed to be attainable)

existent (adjective)	objective (adjective)
having existence or being or actuality	undistorted by emotion or personal bias; based on observable phenomena
being or occurring in fact or actuality; having verified existence; not illusory	serving as or indicating the object of a verb or of certain prepositions and used for certain other purposes
presently existing in fact and not merely potential or possible	belonging to immediate experience of actual things or events
	emphasizing or expressing things as perceived without distortion of personal feelings or interpretation