void vs nonexistence

void and nonexistence both are nouns.

Word	Noun	Adjective	Verb	Adverb
void	Yes	Yes	Yes	No
nonexistence	Yes	No	No	No

As nouns, nonexistence is a hypernym of void; that is, nonexistence is a word with a broader meaning than void:

Other hypernyms of void include nonentity.

void (noun)	nonexistence (noun)
an empty area or space	the state of not existing
the state of nonexistence

void (adjective)	nonexistence (adjective)
containing nothing
lacking any legal or binding force

void (verb)	nonexistence (verb)
excrete or discharge from the body
take away the legal force of or render ineffective
clear (a room, house, place) of occupants or empty or clear (a place or receptacle) of something
declare invalid